Goodman, for example, consuming large fish (6)
I believe the answer is:
blenny
'fish' is the definition.
(blenny is a kind of fish)
'goodman for example consuming large' is the wordplay.
'goodman for example' becomes 'Benny' (jazz clarinetist Benny Goodman).
'consuming' indicates putting letters inside.
'large' becomes 'L' (eg in clothes sizes).
'benny' enclosing 'l' is 'BLENNY'.
(Other definitions for blenny that I've seen before include "Spiny-finned fish" , "slimy fish" .)