Pass Charlie what's laid on in the bathroom (1,3,1)

I believe the answer is:

h and c

'what's laid on in the bathroom' is the definition.
(hot and cold taps)

'pass charlie' is the wordplay.
'pass' becomes 'hand' (synonyms).
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'hand'+'c'='H AND C'

(Another definition for h and c that I've seen is " basic hotel facilities?".)

I've seen this clue in The Guardian.

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