Go on the current course (5)
I believe the answer is:
drift
I believe this clue is a triple definition!
'go' is the first definition.
(drifting is a kind of going)
'on' is a link.
'the current' is the second definition.
(can be similar in meaning in navigation contexts)
'course' is the third definition.
(thesaurus)
(Other definitions for drift that I've seen before include "Float along as on waves" , "Move with the current" , "Bank (of snow)" , "Large heap (of snow)" , "Walk casually; snow pile" .)