King leaving reinforcements in Lancashire town (5)

I believe the answer is:

bacup

'lancashire town' is the definition.
(I've seen this before)

'king leaving reinforcements' is the wordplay.
'king' becomes 'K' (abbreviation for king in chess).
'leaving' suggests deleting specific letters.
'reinforcements' becomes 'back-up' (as in calling for back-up).
'backup' with 'k' removed is 'BACUP'.

'in' is the link.

(Another definition for bacup that I've seen is " Lancashire town".)

I've seen this clue in The Times.

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