Weak policeman deserving prison (10)

I believe the answer is:

wandsworth

'prison' is the definition.
(Wandsworth is a London prison)

'weak policeman deserving' is the wordplay.
'weak' becomes 'wan' (similar in meaning).
'policeman' becomes 'ds' (I've seen this in other clues).
'deserving' becomes 'worth' (synonyms).
'wan'+'ds'+'worth'='WANDSWORTH'

I've seen this clue in The Times.

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