His purpose includes an incentive (4)

I believe the answer is:

spur

'an incentive' is the definition.
(an incentive spurs someone on)

'his purpose includes' is the wordplay.
'includes' says the answer is hidden in the clue.
'SPUR' is hidden within 'his purpose'.

(Other definitions for spur that I've seen before include "railway siding" , "Cowboy's goading instrument" , "Hurry up" , "Incentive; branch line" , "Goad, prod" .)

I've seen this clue in The Daily Express.

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