Getting better about line in winter sport (7)
I believe the answer is:
curling
'winter sport' is the definition.
(I know that curling is a type of winter sport)
'getting better about line in' is the wordplay.
I cannot really see how this works, but
'about' could be 'c' (abbreviation for circa) and 'c' is found within the answer.
'line' could be 'l' (used when specifying particular lines from a poem) and 'l' is found within the answer.
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for curling that I've seen before include "Hairdo equipment -- closing grunt (anag)" , "Winter sport where stones are slid towards a target" , "Game played on ice" , "providing treatment for shock?" , "Not a straightforward" .)