Creeps travel aimlessly in Golfs every now and then (7)
I believe the answer is:
grovels
'creeps' is the definition.
('grovel' can be a synonym of 'creep')
'travel aimlessly in golfs every now and then' is the wordplay.
'travel aimlessly' becomes 'rove'.
'in' is an insertion indicator.
'every now and then' means one should take alternating letters (letters selected at regular intervals).
The alternate letters of 'golfs' are 'gls'.
'rove' placed inside 'gls' is 'GROVELS'.
(Other definitions for grovels that I've seen before include "Abases oneself" , "'Creeps, fawns (7)'" .)