Sister catches little Caitlin and sports-person (6)
I believe the answer is:
skater
'person' is the definition.
(skater is a kind of person)
'sister catches little' is the wordplay.
'sister' becomes 'sr' (I've seen this in other clues).
'catches' is an insertion indicator.
'little' becomes 'kate' (I am not sure about this - if you are sure you should believe this answer much more).
'sr' going around 'kate' is 'SKATER'.
'caitlin and sports' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for skater that I've seen before include "Rink performer" , "One on blades/wheels" , "Winter sportsperson" , "Winter sports participant" , "One gliding on ice" .)