Much sought-after (3)
I believe the answer is:
hot
'much sought-after' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hot that I've seen before include "Sultry in psychotic way" , "Sultry or angry" , "Very popular" , "Angry or very warm" , "SECOND PART OF 11" .)