People who aren't pro Republican in Team USA, curiously (8)
I believe the answer is:
amateurs
'people who aren't pro' is the definition.
'amateurs' can be an answer for 'people' (amateur is a kind of person). I'm not sure about the remainder of the definition.
'republican in team usa curiously' is the wordplay.
'republican' becomes 'R' (abbreviation).
'in' is an insertion indicator.
'curiously' indicates an anagram.
'team'+'usa'='teamusa'
'teamusa' is an anagram of 'amateus'.
'r' inserted inside 'amateus' is 'AMATEURS'.
Can you help me to learn more?
(Other definitions for amateurs that I've seen before include "Dilettantes" , "sporting types" , "They're enthusiastic" , "inept lot?" , "They play for love of the game" .)