A glass container not quite closed (4)

I believe the answer is:

ajar

'not quite closed' is the definition.
(I've seen this in another clue)

'a glass container' is the wordplay.
'glass container' becomes 'jar' (I've seen this in another clue).
'a'+'jar'='AJAR'

(Other definitions for ajar that I've seen before include "Not quite shut" , "Fractionally open" , "near closing?" , "Not quite closed" , "Half open" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app