Warm up for a theatrical part (4)

I believe the answer is:

heat

'warm up' is the definition.
(thesaurus)

'for a theatrical part' is the wordplay.
'part' indicates the answer is hidden within the clue.
'HEAT' is hidden in the letters of 'for theatrical'.

(Other definitions for heat that I've seen before include "Vehemence" , "Warm up" , "Toast" , "Warmth - gossip mag" , "Hotness" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app