Crossword Genius

In a week or so city goes to ruin (6)

Ross

I believe the answer is:

decays

'goes to ruin' is the definition.
(to decay is to become ruined)

'in a week or so city' is the wordplay.
'in' indicates putting letters inside.
'a week or so' becomes 'days' (a week is 7 days).
'city' becomes 'EC' (the City of London postcode).
'days' placed around 'ec' is 'DECAYS'.

(Other definitions for decays that I've seen before include "Rots, moulders away" , "Rots, disintegrates" , "Decomposes or falls into ruin" , "Rots and decomposes" , "Goes off" .)

I've seen this clue in The Guardian.
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