Viking calls man back (8)
I believe the answer is:
norseman
'viking' is the definition.
(I've seen this before)
'calls man back' is the wordplay.
I cannot quite see how this works, but
'man' could be 'em' and 'em' is present in the answer.
This explanation may well be incorrect...
(Other definitions for norseman that I've seen before include "A viking, perhaps" , "Scandinavian" , "one attacking north-east?" , "invader" .)