Thrown out of bed earlier than arranged (5)
I believe the answer is:
upset
'thrown' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes mean the same thing.
'out of bed earlier than arranged' is the wordplay.
I cannot really see how this works, but
'arranged' could be 'set' (similar in meaning) and 'set' is found in the answer.
'out of bed' could be 'up' (synonyms) and 'up' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for upset that I've seen before include "Unexpected sports outcome" , "Disturb or knock over" , "Knock over; worried" , "Disconcert" , "Trouble" .)