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Caught husband with resin and cannabis in vessel used after dark? (7,3)

Ross

I believe the answer is:

chamber pot

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'vessel used after dark?' is the definition.
I can't tell whether this defines the answer.

'caught husband with resin and cannabis' is the wordplay.
'caught husband' becomes 'ch' (this might be a standard abbreviation which I don't know about).
'with' says to put letters next to each other.
'resin' becomes 'amber' (amber is a type of resin).
'and' is a charade indicator (letters next to each other).
'cannabis' becomes 'pot' (synonyms).
'ch'+'amber'+'pot'='CHAMBER POT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for chamber pot that I've seen before include "Where movement performed" , "Jerry" .)

I've seen this clue in The Times.
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