Dexter is on this fit team (5,4)
I believe the answer is:
right side
'dexter' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'on this fit team' is the wordplay.
'on' means one lot of letters go next to another.
'this fit' becomes 'right' (both can mean proper or appropriate).
'team' becomes 'side' (both can mean a sports team).
'right' put next to 'side' is 'RIGHT SIDE'.
'is' acts as a link.
Can you help me to learn more?
I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution?
Install my app