Crossword Genius

Expression of regret about large town's lewdness (8)

Ross

I believe the answer is:

salacity

'lewdness' is the definition.
('salacity' can be a synonym of 'lewdness')

'expression of regret about large town's' is the wordplay.
'expression of regret' becomes 'alas' (I've seen this before).
'about' says the letters should be written backwards.
'large town' becomes 'city' (I've seen this before).
'alas' back-to-front is 'sala'.
'sala'+'city'='SALACITY'

(Another definition for salacity that I've seen is " Lewdness or eroticism".)

I've seen this clue in The Telegraph.
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