First name or odd name for borderline personality? (12)
I believe the answer is:
frontiersman
'borderline personality?' is the definition.
(someone living at a border or frontier)
'first name or odd name' is the wordplay.
'odd' indicates anagramming the letters.
'name' becomes 'n' (common abbreviation e.g. on forms).
'first'+'name'+'or'='firstnameor'
'firstnameor' anagrammed gives 'frontiersma'.
'frontiersma'+'n'='FRONTIERSMAN'
'for' is the link.
(Other definitions for frontiersman that I've seen before include "Border dweller" , "his position is borderline" , "pioneer" .)