Have to go round the Orient in a tug (5)
I believe the answer is:
heave
'a tug' is the definition.
(thesaurus)
'have to go round the orient' is the wordplay.
'to go round' is an insertion indicator.
'the orient' becomes 'e'.
'have' placed around 'e' is 'HEAVE'.
'in' acts as a link.
(Other definitions for heave that I've seen before include "Be sick; rise and fall" , "Drag" , "Retch - lift using much effort" , "Pull - retch" , "Produce (a sigh); haul" .)