Over-the-top (5)
'over-the-top' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for extra that I've seen before include "Bye or wide, for example" , "23 player?" , "Ancillary" , "Bit-part actor" , "Bit actor in film" .)
(Other definitions for outre that I've seen before include "appear eccentric" , "Disturbingly unusual" , "over the top" , "Shocking - route (anag)" , "Eccentric or unseemly - in France" .)