Shades to fix a busted arm (10)

I believe the answer is:

adumbrates

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'shades' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how they can define each other.

'fix a busted arm' is the wordplay.
'fix' indicates an anagram.
'a'+'busted'+'arm'='abustedarm'
'abustedarm' with letters rearranged gives 'ADUMBRATES'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for adumbrates that I've seen before include "augurs" , "Overshadows" .)

I've seen this clue in the Sydney Morning Herald.

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