Brace of fresh lobster (7)
I believe the answer is:
bolster
'brace' is the definition.
(thesaurus)
'fresh lobster' is the wordplay.
'fresh' indicates anagramming the letters.
'lobster' anagrammed gives 'BOLSTER'.
'of' acts as a link.
(Other definitions for bolster that I've seen before include "Large pillow" , "Provide reinforcement" , "Shore up" , "Chisel - long cushion" , "Lobster (anag.)" .)