Expert team comes back across south Romania (7)
I believe the answer is:
maestro
'expert' is the definition.
(I've seen this before)
'team comes back across south romania' is the wordplay.
'comes back' is a reversal indicator.
'across' means one lot of letters goes inside another.
'south' becomes 's' ('S' can be a synonym of 'south').
'romania' becomes 'ro' (I can't justify this - if you can you should give a lot more credence to this answer).
'team' in reverse letter order is 'maet'.
'maet' going around 's' is 'maest'.
'maest'+'ro'='MAESTRO'
Can you help me to learn more?
(Other definitions for maestro that I've seen before include "hotshot" , "Gifted performer" , "Artist of consummate skill: conductor" , "Orchestral conductor" , "Eminent conductor or composer" .)