Possible Clues:

• Obvious diet Nev digested
• See 27-Across
• It's obvious that I have come back with the sign of a blow
• Patent
• The obvious way to plunge back with the makings of 17 across
• Plunge up with the tangled net - obvious, isn't it?
• Clear reverse descent by hospital department
• It's clear I had to enter race
• Open race I had entered
• Clear identification needed in the case of something happening