Big step putting those Romanian leaders in team (6)
I believe the answer is:
stride
'big step' is the definition.
(I've seen this in another clue)
'those romanian leaders in team' is the wordplay.
'leaders' suggests taking the first letters.
'in' is an insertion indicator.
'team' becomes 'side' (both can mean a sports team).
The first letters of 'those romanian' is 'tr'.
'tr' inserted within 'side' is 'STRIDE'.
'putting' acts as a link.
(Other definitions for stride that I've seen before include "Take a long step" , "Walk along in direst way" , "A big step forward" , "Long step of direst kind" , "Move with long steps" .)