Position held by Pakistan, certainly (6)
I believe the answer is:
stance
'position' is the definition.
(I know that position can be written as stance)
'held by pakistan certainly' is the wordplay.
'held by' indicates the answer is hidden within the clue.
'STANCE' is hidden within 'pakistan certainly'.
(Other definitions for stance that I've seen before include "Posture assumed" , "position when batting" , "Deportment" , "Position, at the tee perhaps" , "Way of standing, like golfer addressing ball" .)