Crossword Genius

Acknowledgement that may be jolly? (5)

Ross

I believe the answer is:

roger

'jolly?' is the definition.
Both the definition and answer are verbs in their base form.
Maybe you can see an association between them that I can't see?

I don't understand how the remainder of the clue works.

(Other definitions for roger that I've seen before include "Boy's name - message understood" , "Received (in radio comms)" , "Sir - de Coverley, English country dance" , "... guy" , "Radio acknowledgment" .)

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