Has bath just before bed for a fresh start (5,5)
I believe the answer is:
clean slate
'for a fresh start' is the definition.
(synonyms)
'has bath just before' is the wordplay.
'has bath' becomes 'slate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'just' becomes 'clean' (similar in meaning).
'before' is a charade indicator (letters next to each other).
'slate' after 'clean' is 'CLEAN SLATE'.
'bed' acts as a link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for clean slate that I've seen before include "A record without dishonour" , "making a fresh start?" , "good record" , "new start" .)