Lobster has cry if boiled (8)
I believe the answer is:
crayfish
'lobster' is the definition.
(crayfish is a kind of lobster)
'has cry if boiled' is the wordplay.
'boiled' is an anagram indicator.
'has'+'cry'+'if'='hascryif'
'hascryif' with letters rearranged gives 'CRAYFISH'.
(Other definitions for crayfish that I've seen before include "Lobster-like creature" , "Edible crustacean" , "seafood" , "little nipper" , "Lobster" .)