The dramatic part of an unfamiliar lore (4)
I believe the answer is:
role
'the dramatic part' is the definition.
(I've seen this in another clue)
'an unfamiliar lore' is the wordplay.
'an unfamiliar' indicates anagramming the letters.
'lore' with letters rearranged gives 'ROLE'.
'of' acts as a link.
(Other definitions for role that I've seen before include "Part, portrayal" , "Function; part" , "Function in life" , "Part (in drama)" , "Acting part" .)