Great little flier, maybe (3)

I believe the answer is:

tit

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'great little flier' is the definition.
'tit' can be an answer for 'flier' (type of bird). I am not certain of the 'great little' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tit that I've seen before include "Boob made backing" , "Small songbird" , "Small garden bird" , "useless horse, or not?" , "What you swap for tat" .)

I've seen this clue in the Evening Standard.

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