Injured fellow had to clutch limb (6)
I believe the answer is:
harmed
'injured' is the definition.
(similar in meaning)
'fellow had to clutch limb' is the wordplay.
'fellow had' becomes 'he'd' (contraction of 'he had').
'to clutch' means one lot of letters goes inside another.
'limb' becomes 'arm' (arm is a kind of limb).
'hed' going around 'arm' is 'HARMED'.
(Other definitions for harmed that I've seen before include "Injured or damaged" , "Hurt" .)