Team in a troublesome tour, liable to lose (8)
I believe the answer is:
outsider
'liable to lose' is the definition.
I can't tell whether this definition defines the answer.
'team in a troublesome tour' is the wordplay.
'team' becomes 'side' (both can mean a sports team).
'in' means one lot of letters goes inside another.
'a troublesome' is an anagram indicator.
'tour' with letters rearranged gives 'outr'.
'side' placed within 'outr' is 'OUTSIDER'.
Can you help me to learn more?
(Other definitions for outsider that I've seen before include "One who doesn't belong (or isn't fancied)" , "expected to be unsuccessful" , "1000/1 shot" , "Not one of the in-crowd" , "Unfancied competitor" .)