Parking so men can get round track (5)
I believe the answer is:
Here is my best explanation:
'track' is the definition.
(spoor is a kind of track)
'parking so men can get round' is the subsidiary indication.
'parking' becomes 'p'.
'men' becomes 'or' (I've seen this in other clues).
'can get round' means one lot of letters goes inside another.
'p' inserted within 'soor' is 'spoor'.
(Other definitions for spoor that I've seen before include "Animal's track or scent", "Animal track or scent", "Animal's track/scent", "Track of wild animal", "Scent, track of animal", "Animal track, trail", "24 [TRAIL]", "Trail of animal", "Beast's trail" and "Track or scent of an animal".)