Female with useless fellow, flipping tool (7)

I believe the answer is:

fretsaw

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'tool' is the definition.
(I've seen this before)

'female with useless fellow flipping' is the wordplay.
'female' becomes 'f' (common abbreviation).
'with' becomes 'w' (abbreviation).
'useless fellow' becomes 'aster' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'flipping' is a reversal indicator.
'w'+'aster'='waster'
'waster' written backwards gives 'retsaw'.
'f'+'retsaw'='FRETSAW'

Can you help me to learn more?

(Other definitions for fretsaw that I've seen before include "Fine-toothed tool" , "cutter" , "Woodworking tool" , "Tool for cutting designs in wood" , "Woodcutter" .)

I've seen this clue in The Guardian.

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