Crossword Genius

What you will do if you can (8)

Ross

I believe the answer is:

preserve

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'you can' is the definition.
'preserve' can be an answer for 'can' (preserve in a can). I'm unsure of the 'you' bit.

'what you will do' is the wordplay.
'what you will' becomes 'pre' (I can't justify this - if you can you should give a lot more credence to this answer).
'do' becomes 'serve' (synonyms).
'pre'+'serve'='PRESERVE'

'if' acts as a link.

Can you help me to learn more?

(Other definitions for preserve that I've seen before include "Refuse to give up" , "defend" , "area where game is held" , "Keep alive, maintain" , "Maintain, protect from decay" .)

I've seen this clue in The Irish News and The Globe and Mail.
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