Passion of a theatrical nature (4)
I believe the answer is:
heat
'passion' is the definition.
(synonyms)
'of a theatrical nature' is the wordplay.
'of' indicates a hidden word.
'HEAT' can be found hidden inside 'theatrical nature'.
(Other definitions for heat that I've seen before include "Apply warmth" , "brings out a sweat?" , "Provide warmth" , "Level of spice" , "Toast" .)