Crossword Genius

Act artificially polite when cross within (7)

Ross

I believe the answer is:

exploit

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'act' is the definition.
(exploit is a kind of act)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for exploit that I've seen before include "Benefit from" , "Capitalise on, take advantage of" , "Make full use of" , "Daring feat; use unfairly" , "Make use of - achievement" .)

I've seen this clue in The Hindu.
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