Ace to grill a fresh snapper? (9)
I believe the answer is:
alligator
'snapper?' is the definition.
(I've seen this before)
'ace to grill a fresh' is the wordplay.
'ace' becomes 'a'.
'fresh' indicates an anagram.
'to'+'grill'+'a'='togrilla'
'togrilla' is an anagram of 'lligator'.
'a'+'lligator'='ALLIGATOR'
(Other definitions for alligator that I've seen before include "Predatory cold-blooded killer" , "Animal of the crocodile family" , "What can go with pear" , "that is scaled" , "Sort of hide" .)