Fun for a singer on the ascendancy (4)

I believe the answer is:

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This could be a double definition.

'fun' is the first definition.
(what a lark)

'singer on the ascendancy' is the second definition.
'lark' can be an answer for 'singer' (lark is a kind of birdanimal). I'm unsure of the 'on the ascendancy' bit.

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for lark that I've seen before include "Flighty type" , "what one may get up to?" , "in-flight performer" , "Mess about" , "Songbird - 3" .)

I've seen this clue in the Evening Standard.

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