Dawn gets boy out of bed, we hear (5)
I believe the answer is:
sunup
'dawn' is the definition.
('sunup' can be a synonym of 'dawn')
'boy out of bed we hear' is the wordplay.
I cannot quite understand how this works, but
'out of bed' could be 'up' ('up' can be a synonym of 'out of bed') and 'up' is located in the answer.
The remaining letters 'sun' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for sunup that I've seen before include "Literal word for the dawn" , "Solar rising" , "Literal version of dawn" , "time of day" , "Dawn (mainly US)" .)