Crossword Genius

Well-oiled instrument cut, then cut again (8)

Ross

I believe the answer is:

banjaxed

I'm a little stuck... Click here to teach me more about this clue!

'cut again' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives occasionally mean the same thing.

'well-oiled instrument cut' is the wordplay.
I cannot quite see how this works, but
'instrument' could be 'ban' (ban is a kind of instrument) and 'ban' is found in the answer.
'cut' could be 'axed' (I've seen this before) and 'axed' is located in the answer.
A single letter 'j' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'then' acts as a link.

Can you help me to learn more?

(Other definitions for banjaxed that I've seen before include "Ruined (slang)" , "Spoiled" .)

I've seen this clue in the Sydney Morning Herald.
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