Drink Scandinavian nomad left unfinished (3)
I believe the answer is:
lap
'drink' is the definition.
(lapping is a kind of drinking)
'scandinavian nomad left unfinished' is the wordplay.
'scandinavian nomad' becomes 'lapp' (the Lapps are a Scandinavian people).
'left unfinished' means to remove the last letter.
'lapp' with its last letter taken away is 'LAP'.
(Other definitions for lap that I've seen before include "Circuit of racetrack" , "Track circuit; drink" , "Drink (like dog), circuit" , "One circuit of track" , "Single circuit of track" .)