Straight with one’s team? Not entirely (6)
I believe the answer is:
honest
'straight' is the definition.
(similar in meaning)
'with one's team? not entirely' is the wordplay.
'not entirely' indicates the answer is hidden within the clue.
'HONEST' is hidden in the letters of 'with ones team'.
(Other definitions for honest that I've seen before include "Free from guile" , "Without dissimulation or guile" , "Open and truthful" , "Impartial intermediary" , "Truthful in manner" .)