Ornithological frolics? (5)
I believe the answer is:
larks
'frolics?' is the definition.
('lark' can be a synonym of 'frolic')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for larks that I've seen before include "High jinks" , "Small songbirds" , "guys" , "Birds; fun" , "We sing" .)