Courier to stand with hesitation (6)
I believe the answer is:
bearer
'courier' is the definition.
(I know that bearer is a type of courier)
'stand with hesitation' is the wordplay.
'stand' becomes 'bear' (both can mean to tolerate or endure).
'with' is a charade indicator (letters next to each other).
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'bear'+'er'='BEARER'
'to' acts as a link.
(Other definitions for bearer that I've seen before include "Mourner carrying the coffin at a funeral" , "Messenger - coffin-carrier" , "He helps to carry something - sometimes a coffin" , "He carries something, stretcher or news" , "One presenting cheque" .)