Crossword Genius

Ornithological frolics? (5)

Ross

I believe the answer is:

larks

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'frolics?' is the definition.
('lark' can be a synonym of 'frolic')

I cannot understand how the remainder of the clue works.

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(Other definitions for larks that I've seen before include "High jinks" , "Small songbirds" , "guys" , "Birds; fun" , "We sing" .)

I've seen this clue in The Irish News.
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