Crossword Genius

Flier in inevitable ascent (3)

Ross

I believe the answer is:

bat

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'flier in inevitable ascent' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is the entire clue.

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(Other definitions for bat that I've seen before include "The cricketer wields it" , "Small flying mammal - like 11 Across" , "Cricket implement or flying mammal" , "Pipistrelle" , "Wooden implement for cricket" .)

I've seen this clue in the Evening Standard.
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