Turn for opposition leader's time in charge (6)
I believe the answer is:
rotate
'turn' is the definition.
(rotating is a kind of turning)
'opposition leader's time in charge' is the wordplay.
'leader' suggests taking the first letters.
'time' becomes 't'.
'in' indicates putting letters inside.
'charge' becomes 'rate' (rate is a kind of charge**).
The initial letter of 'opposition' is 'o'.
'o'+'t'='ot'
'ot' going inside 'rate' is 'ROTATE'.
'for' acts as a link.
(Other definitions for rotate that I've seen before include "'Er, to a T? (anag)" , "roll" , "Turn around an axle, swivel" , "Pivot" , "Make to spin around" .)