Crossword Genius

Open at lunch, unusually (7)

Ross

I believe the answer is:

unlatch

'open' is the definition.
(unlatching something is opening it)

'at lunch unusually' is the wordplay.
'unusually' is an anagram indicator.
'at'+'lunch'='atlunch'
'atlunch' with letters rearranged gives 'UNLATCH'.

(Other definitions for unlatch that I've seen before include "Free bar" , "Unfasten (a door)" .)

I've seen this clue in the Evening Standard.
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