Crossword Genius

Was single potty adequate receptacle for drinker? (9)

Ross

I believe the answer is:

wineglass

'adequate receptacle for drinker?' is the definition.
(receptacle used by someone drinking wine)

'was single potty' is the wordplay.
'potty' indicates an anagram.
'was'+'single'='wassingle'
'wassingle' with letters rearranged gives 'WINEGLASS'.

(Other definitions for wineglass that I've seen before include "possibly held in this port? The opposite" , "Vessel with bowl and stem" .)

I've seen this clue in The Guardian.
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