In feral den, teen's cooked but still firm (2,5)
I believe the answer is:
al dente
'cooked but still firm' is the definition.
(I've seen this before)
'in feral den teen's' is the wordplay.
'in' indicates the answer is hidden within the clue.
'AL DENTE' can be found hidden inside 'feral den teens'.
(Other definitions for al dente that I've seen before include "Of vegetables, still firm to the bite when cooked" , "Still firm when eaten" , "(Of cooked vegetables) still firm when bitten" , "(Of pasta) firm to the bite" , "Of pasta or vegetables, firm when bitten" .)