Forcibly remove winning Test captain (6)
I believe the answer is:
uproot
'forcibly remove' is the definition.
(I've seen this before)
'winning test captain' is the wordplay.
'winning' becomes 'up' (eg being up at half time in football).
'test captain' becomes 'root' (I am not sure about this - if you are sure you should believe this answer much more).
'up'+'root'='UPROOT'
Can you help me to learn more?
(Other definitions for uproot that I've seen before include "Weed out" , "Completely destroy" , "Displace from native surroundings" , "Pull (plant) out of earth" , "Remove from the ground" .)