Cooking in gas, try fish (8)
I believe the answer is:
stingray
'fish' is the definition.
(stingray is a kind of fish)
'cooking in gas try' is the wordplay.
'cooking' is an anagram indicator.
'in'+'gas'+'try'='ingastry'
'ingastry' is an anagram of 'STINGRAY'.
(Other definitions for stingray that I've seen before include "Marine creature with venomous tail" , "Dangerous fish" , "TV show" , "Poisonous spined fish" , "Large fish with tail spine" .)