Actor in a play, perhaps a Split personality? (8)
I believe the answer is:
croatian
'a split personality?' is the definition.
(I've seen this in another clue)
'actor in a play' is the wordplay.
'actor' becomes 'croat' (I can't justify this - if you can you should give a lot more credence to this answer).
'play' indicates anagramming the letters.
'in'+'a'='ina'
'ina' anagrammed gives 'ian'.
'croat'+'ian'='CROATIAN'
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for croatian that I've seen before include "One from Zagreb, say" , "from area in Europe" , "Slavic language" , "European native" , "Native to a Balkan republic that became independent in 1991" .)