Athlete Jay subs for Henry in team sport (6)
I believe the answer is:
jockey
'henry in team sport' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'athlete jay subs' is the wordplay.
'athlete' becomes 'jock' (synonyms).
'jay subs' becomes 'ey' (I can't justify this - if you can you should believe this answer much more).
'jock'+'ey'='JOCKEY'
'for' is the link.
Can you help me to learn more?
(Other definitions for jockey that I've seen before include "A professional horse rider" , "Manoeuvre for advantage like horse race rider" , "Struggle for position" , "Rider of racehorse" .)