Action on course to promote change in voting habits (9)

I believe the answer is:

backswing

'action on course' is the definition.
(backwards swing on a golf course)

'promote change in voting habits' is the wordplay.
'promote' becomes 'back' (back can mean to support or endorse).
'change in voting habits' becomes 'swing' (a swing is a change of voting preference).
'back'+'swing'='BACKSWING'

'to' is the link.

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app