Crossword Genius

Part of joint held by Bill regularly paid off (9)

Ross

I believe the answer is:

amortised

'regularly paid off' is the definition.
(to amortise is to pay off with regular payments)

'part of joint held by bill' is the wordplay.
'part of joint' becomes 'mortise' (as in a mortise and tenon joint).
'held by' is an insertion indicator.
'bill' becomes 'ad' (advertisement stuck on wall).
'mortise' placed into 'ad' is 'AMORTISED'.

(Another definition for amortised that I've seen is " Written off over time".)

I've seen this clue in The Times.
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