A gang on leave (7)

I believe the answer is:

abandon

'leave' is the definition.
(to abandon is to leave or desert)

'a gang on' is the wordplay.
'gang' becomes 'band' (I've seen this before).
'a'+'band'+'on'='ABANDON'

(Other definitions for abandon that I've seen before include "Leave behind - licentiousness" , "scrap" , "Kick" , "Desert, forsake" , "Desert - recklessness" .)

I've seen this clue in The Telegraph.

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