Weary, about to leave, went to bed (5)
I believe the answer is:
tired
'weary' is the definition.
(similar in meaning)
'about to leave went to bed' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is present in the answer.
The remaining letters 'tid' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tired that I've seen before include "Weary or fed up" , "In need of sleep" , "Physically or mental weary" , "In need of rest" , "ready for bed" .)