Gatecrasher misses races and rally (6)
I believe the answer is:
gather
'rally' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for gather that I've seen before include "put in pleats" , "Congregate" , "Bring or assemble together" , "Get together" , "Convene" .)