Open at lunch break (7)
I believe the answer is:
unlatch
'open' is the definition.
(thesaurus)
'at lunch break' is the wordplay.
'break' is an anagram indicator.
'at'+'lunch'='atlunch'
'atlunch' with letters rearranged gives 'UNLATCH'.
(Other definitions for unlatch that I've seen before include "Unfasten (a door)" , "Free bar" .)
I've seen this clue in The Guardian and The Globe and Mail.
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