Female ne'er-do-well upset woodcutter (7)
I believe the answer is:
fretsaw
'woodcutter' is the definition.
(I've seen this before)
'female ne'er-do-well upset' is the wordplay.
'female' becomes 'f' (common abbreviation).
'ne'er-do-well' becomes 'waster' (both can mean an idle person).
'upset' says the letters should be written backwards.
'waster' written backwards gives 'retsaw'.
'f'+'retsaw'='FRETSAW'
(Other definitions for fretsaw that I've seen before include "Tool for cutting designs in wood" , "Woodcutter" , "Woodworking tool" , "Fine-toothed tool" , "cutter" .)