One playing minor part in complex tragedy (5)
I believe the answer is:
extra
'one playing minor part' is the definition.
(I've seen this before)
'in complex tragedy' is the wordplay.
'in' says the answer is hidden in the clue.
'EXTRA' is hidden within 'complex tragedy'.
(Other definitions for extra that I've seen before include "spotted at rear of the platoon?" , "More than usual" , "more than required" , "Additional - run - actor - newspaper edition" , "Additional - bye" .)