Various rivals of Tom Daley (6)
I believe the answer is:
divers
'various' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for divers that I've seen before include "ducklike birds" , "Various for underwater workers?" , "competitors at the Olympic Games?" , "Some water-birds; assorted" , "seabirds" .)