Crossword Genius

One container is slightly open (4)

Ross

I believe the answer is:

ajar

'slightly open' is the definition.
(as in a door left ajar)

'one container' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'container' becomes 'jar' (jar is a kind of container).
'a'+'jar'='AJAR'

'is' acts as a link.

(Other definitions for ajar that I've seen before include "A little bit open, like door" , "near closing?" , "Unlatched" , "not slammed shut" , "Half open" .)

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