Help lobster being cooked (7)
I believe the answer is:
bolster
'help' is the definition.
(thesaurus)
'lobster being cooked' is the wordplay.
'being cooked' indicates an anagram (letters cooked into a new form).
'lobster' is an anagram of 'BOLSTER'.
(Other definitions for bolster that I've seen before include "Extended pillow" , "Hold up" , "Support; long pillow" , "Strengthen - long pillow" , "Support - strengthen" .)