Follow a race tip (6)
I believe the answer is:
attend
'follow' is the definition.
(thesaurus)
'a race tip' is the wordplay.
'race' becomes 'tt'.
'tip' becomes 'end'.
'a'+'tt'+'end'='ATTEND'
(Other definitions for attend that I've seen before include "Listen carefully" , "Wait and listen" , "Go regularly to (school)" , "take heed" , "Concentrate carefully" .)