Man from part of Holstein regularly going north (5)
I believe the answer is:
ernie
'man' is the definition.
(I've seen this before)
'part of holstein regularly going north' is the wordplay.
'part of' says the answer is hidden in the clue.
'going north' says the letters should be written backwards.
'einre' can be found hidden inside 'holstein regularly'.
'einre' back-to-front is 'ERNIE'.
'from' acts as a link.
(Other definitions for ernie that I've seen before include "Selector of winning premium bond numbers" , "National Savings computer" , "Bondman" , "One regularly drawing" , "Guy" .)