Go to a bike race on purpose (6)
I believe the answer is:
attend
'go to' is the definition.
(synonyms)
'a bike race on purpose' is the wordplay.
'bike race' becomes 'tt' (short for time trial, type of race).
'on' is a charade indicator (letters next to each other).
'purpose' becomes 'end' (both can mean a goal).
'a'+'tt'+'end'='ATTEND'
(Other definitions for attend that I've seen before include "visit" , "minister" , "Go regularly to, church perhaps" , "Be present or appear at" , "Wait upon or be present" .)