Crossword Genius

Caught, not many would quarrel at length (4)

Ross

I believe the answer is:

feud

'quarrel at length' is the definition.

'caught not many would' is the wordplay.
I cannot quite understand how this works, but
'many' could be 'd' (Roman numeral for 500) and 'd' is present in the answer.
The remaining letters 'feu' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

(Other definitions for feud that I've seen before include "Sustained enmity" , "Private war" , "quarrel without end" , "Long-running disagreement" , "Vendetta" .)

I've seen this clue in The Times and The Sun.
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