Detonating and leaving (7,3)

I believe the answer is:

setting off

I believe this clue is a double definition.

'detonating' is the first definition.
('set off' can be a synonym of 'detonate')

'leaving' is the second definition.
(setting off is a kind of leaving)

'and' acts as a link.

I've seen this clue in the Evening Standard.

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