Angry and tired, though not at first (3)
I believe the answer is:
hot
'angry' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hot that I've seen before include "Very popular" , "Fiery" , "Flaming - spicy" , "Torrid" , "(Of food) spicy" .)