Flowed back but first eat baked beans every day (5)
I believe the answer is:
ebbed
'flowed back' is the definition.
(I've seen this in another clue)
'first eat baked beans every day' is the wordplay.
'first' says to take the initial letters.
'day' becomes 'd' (abbreviation for day).
The initial letters of 'eat baked beans every' is 'ebbe'.
'ebbe'+'d'='EBBED'
'but' acts as a link.
(Other definitions for ebbed that I've seen before include "Went out like tide" , "Flowed back or receded" , "Diminished" .)