Two possible directions from Trondheim, perhaps (5)
I believe the answer is:
norse
'from trondheim perhaps' is the definition.
(Trondheim is in Norway)
'two possible directions' is the wordplay.
'two possible' becomes 'nor' (I can't explain this - if you can you should give a lot more credence to this answer).
'directions' becomes 'se' (I've seen this in other clues).
'nor'+'se'='NORSE'
(Other definitions for norse that I've seen before include "Relating to Norway" , "Ancient Scandinavian language" , "Old Scandinavian tongue" , "Old European" , "Family of Germanic languages spoken in Scandinavia and Iceland" .)