Minute clues about small body parts (7)
I believe the answer is:
muscles
'body parts' is the definition.
(muscle is a kind of body part)
'minute clues about small' is the wordplay.
'minute' becomes 'm' (abbreviation).
'about' indicates an anagram.
'small' becomes 's' (abbreviation - e.g. clothes size).
'clues' with letters rearranged gives 'uscle'.
'm'+'uscle'+'s'='MUSCLES'
(Other definitions for muscles that I've seen before include "lot of beef" , "Sinews" , "Contracting body parts" , "Vital factors" , "Body parts like biceps" .)