Crossword Genius

A bar closing early is concerning (2,2)

Ross

I believe the answer is:

as to

'is concerning' is the definition.
(I've seen this in another clue)

'a bar closing early' is the wordplay.
'bar' becomes 'stop' (bar can mean to stop or prevent).
'closing early' means to remove the last letter.
'stop' with its last letter removed is 'sto'.
'a'+'sto'='AS TO'

(Another definition for as to that I've seen is " Concerning".)

I've seen this clue in The Times.
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