Central sheen in exotic light source (7,7)
I believe the answer is:
chinese lantern
'light source' is the definition.
(thesaurus)
'central sheen in exotic' is the wordplay.
'exotic' is an anagram indicator (an unusual form of the letters).
'central'+'sheen'+'in'='centralsheenin'
'centralsheenin' anagrammed gives 'CHINESE LANTERN'.
(Other definitions for chinese lantern that I've seen before include "type of fruit" , "producing output of Asian light industry" , "may throw some light on mandarins?" , "Physalis; source of light" , "plant" .)