Follow roller, heading off (4)
I believe the answer is:
heel
'follow' is the definition.
(I know that heel is a more specific form of the action follow)
'roller heading off' is the wordplay.
'roller' becomes 'wheel' (I've seen this in another clue).
'heading off' means to remove the first letter.
'wheel' with its initial letter removed is 'HEEL'.
(Other definitions for heel that I've seen before include "I might let down" , "horrible person" , "Command to a trained dog" , "Lean over; part of foot" , "See 1 down" .)