Batsman ends suppressing naked muscularity (5)
I believe the answer is:
brawn
'muscularity' is the definition.
(I've seen this before)
'batsman ends suppressing naked' is the wordplay.
'ends' suggests removing the centre.
'suppressing' indicates putting letters inside.
'naked' becomes 'raw' (I've seen this before).
'batsman' with its centre removed is 'bn'.
'bn' enclosing 'raw' is 'BRAWN'.
(Other definitions for brawn that I've seen before include "Jellied meat - muscle" , "Muscle (as opposed to brain)" , "This is strong" , "Beefy strength" , "Strength; a jellied loaf" .)