Leader abandons modest expedition (5)

I believe the answer is:

haste

I believe this is a double definition.

'leader abandons modest' is the first definition.
(I've seen this before)

'expedition' is the second definition.
(I've seen this before)

(Other definitions for haste that I've seen before include "Urgency of action" , "Expedition" , "Heats (anag.)" , "furious activity" , "Rash speed" .)

I've seen this clue in The Sun.

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