Footprint Rover trailed catching lone wolf (9)
I believe the answer is:
introvert
'lone wolf' is the definition.
(lone wolf can mean a solitary person)
'footprint rover trailed catching' is the wordplay.
'catching' indicates the answer is hidden within the clue.
'INTROVERT' can be found hidden inside 'footprint rover trailed'.
(Other definitions for introvert that I've seen before include "Turn inwards" , "Self-absorbed person" , "one's reserved" , "Withdrawn type" , "One who's withdrawn" .)