Sabotage drink mixed for sports activity (13)
I believe the answer is:
skateboarding
'sports activity' is the definition.
'skateboarding' can be an answer for 'activity' (skateboarding is a kind of activity). I am not sure about the 'sports' bit.
'sabotage drink mixed' is the wordplay.
'mixed' is an anagram indicator.
'sabotage'+'drink'='sabotagedrink'
'sabotagedrink' is an anagram of 'SKATEBOARDING'.
'for' is the link.
Can you help me to learn more?
(Other definitions for skateboarding that I've seen before include "Moving using strip of wood on wheels" , "Pastime on wheels" , "Wheeled recreation" , "Teenagers' pastime" , "sport" .)