The Times - Cryptic - This puzzle, used in the Preliminary A round of the 2013 Times National Crossword Championship, was solved correctly within the time limit by 48% of the competitors. - November 6, 2013

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Clues Answers
A frog is a problem in this site for swallows THROAT
After end of 1920s, flapper makes jazz SWING
American getting temporary lodging on educational grounds CAMPUS
Bishop drifting before finding a place for life BIOSPHERE
Brief separation preceding affair? It might provide space for this BREATHING
Burning may spread from one's mouth, to seem interminable DRAGON
Business class at the front, whenever linked to service CONCERN
Cloth to stop, eg, gravy, flesh and blood going under raised threads NAPKIN
Covenant apparently resembling a special gift TREATY
Desperately cling to faith in feud within US comedian's family? HOPEAGAINSTHOPE
Getting on reclaimed land, but not parking OLDER
Handy bit of soft-pedalling in recession ADEPT
Having pronounced sharpness is good in old sea dog's sword CUTGLASS
Head eliminating extremes of amorous behaviour NOGGIN
Image handling arranged by columns suited to newspapers PRINTABLE
Clues Answers
Limit cost, sharing pence in unaccountable change CAPRICE
Not quite enough funds available to move BUDGE
Persistent Venetian magistrate incarcerating Grand Duke DOGGED
Possible bonus, give or take billions, in crude accommodation CASHBACK
Protection on hand for dealing with hot potatoes? OVENGLOVE
Refresher course possibly prescribed for study around the globe SORBET
Saint almost thought to give up a murderer PATRICIDE
Say goodbye to food and water supply FAREWELL
Someone being vocal about "beef" from nag that's fed baloney PROTESTER
Something that sticks out when wrapping with string TWINE
Soviet Union's leaders curtailed my showing awesome beauty SUBLIME
Spontaneous coming out not supposed to be repeated in one place LIGHTNINGSTRIKE
Triangle constructed using no fractions INTEGRAL
Wild notion that man is entering middle of ice age CHIMERA
Words essentially understood by a — by a particular group ARGOT