He had held the arm that was injured (6)

I believe the answer is:

harmed

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'injured' is the definition.
(harming is a kind of injuring)

'he had held the arm' is the wordplay.
'he had' becomes 'hed'.
'held' is an insertion indicator.
'hed' enclosing 'arm' is 'HARMED'.

'that was' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for harmed that I've seen before include "Hurt" , "Injured or damaged" .)

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