Injured the limb he'd struck out! (6)
I believe the answer is:
harmed
'injured' is the definition.
(similar in meaning)
'limb he'd struck out' is the wordplay.
I cannot quite understand how this works, but
'limb' could be 'arm' (arm is a kind of limb) and 'arm' is found within the answer.
'he'd' could be 'hed' and 'hed' is found within the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'the' is the link.
Can you help me to learn more?
(Other definitions for harmed that I've seen before include "Hurt" , "Injured or damaged" .)