Little Benjamin holds large fish (6)

I believe the answer is:

blenny

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'fish' is the definition.
(blenny is a kind of fish)

'little benjamin holds large' is the wordplay.
'little' becomes 'l' (abbreviation).
'benjamin' becomes 'ben' (short for Benjamin).
'holds' is an insertion indicator.
'large' becomes 'ny' (I can't justify this - if you can you should believe this answer much more).
'l' going within 'ben' is 'blen'.
'blen'+'ny'='BLENNY'

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(Other definitions for blenny that I've seen before include "Spiny-finned fish" , "slimy fish" .)

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