Possible Clues:

• 'Hinder, prevent progress (6)'
• Situation from which it is almost impossible to proceed
• It's my convertible close to office block
• Thwart — block — my site (anag)
• 'Hinder, obstruct (6)'
• Really frustrate
• Block the path of, as on golf green
• Of course one has got in the way that's fit only for pigs to start with
• Drunk is yet to swallow medium Scotch
• Impede, say golf stroke