Divisions of some contests (6)
I believe the answer is:
rounds
'divisions of some contests' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rounds that I've seen before include "periods of fighting" , "A number of them in a boxing bout" , "Series of calls made by doctor" , "Routes for deliverers" , "Stages in a competItion" .)