A grate, not quite shut (4)

I believe the answer is:

ajar

'not quite shut' is the definition.
(I've seen this before)

'a grate' is the wordplay.
'grate' becomes 'jar' (I've seen this before).
'a'+'jar'='AJAR'

(Other definitions for ajar that I've seen before include "opened tentatively?" , "Unlatched" , "Fractionally open" , "(Door) to, not shut" , "not slammed shut" .)

I've seen this clue in The Telegraph.

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