Putting off engineer undoing jar (10)
I believe the answer is:
adjourning
'putting off' is the definition.
'engineer undoing jar' is the wordplay.
'engineer' indicates an anagram.
'undoing'+'jar'='undoingjar'
'undoingjar' with letters rearranged gives 'ADJOURNING'.
(Another definition for adjourning that I've seen is " Postponing".)
I've seen this clue in The Guardian.
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