Crossword Genius

Jack having a drop of rum, and glass of beer (3)

Ross

I believe the answer is:

jar

'glass of beer' is the definition.
(I've seen this before)

'jack having a drop of rum' is the wordplay.
'jack' becomes 'j' (playing card abbreviation).
'having' is a charade indicator (letters next to each other).
'drop of' indicates taking the first letters.
The first letter of 'rum' is 'r'.
'j'+'a'+'r'='JAR'

'and' acts as a link.

(Other definitions for jar that I've seen before include "Pint glass of beer, perhaps" , "Enduring courage" , "Wide-mouthed container" , "Glass of beer (colloq.)" , "Vessel; sudden impact" .)

I've seen this clue in The Times.
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