The stricken slayer passes on (6)
I believe the answer is:
'passes on' is the definition.
(I've seen this in another clue)
'the stricken slayer' is the wordplay.
'the stricken' indicates anagramming the letters.
'slayer' is an anagram of 'RELAYS'.
(Other definitions for relays that I've seen before include "Races where a baton is passed from one to another" , "Races with teams and batons" , "Rebroadcasts" , "Races with team members who pass a baton" , "Races featuring running teams and baton passing" .)