Open for a drink (4)

I believe the answer is:

ajar

'open' is the definition.
('ajar' can be similar in meaning to 'open')

'a drink' is the wordplay.
'drink' becomes 'jar' (colloquial**).
'a'+'jar'='AJAR'

'for' is the link.

(Other definitions for ajar that I've seen before include "Half-closed" , "(Of door) slightly open" , "Part-open" , "Open by a chink" , "A little bit open, like door" .)

I've seen this clue in the Evening Standard.

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