English bishops flow out (3)
I believe the answer is:
ebb
'flow out' is the definition.
'english bishops' is the wordplay.
'english' becomes 'e' (abbreviation).
'bishops' becomes 'bb' (I've seen this in other clues).
'e'+'bb'='EBB'
(Other definitions for ebb that I've seen before include "(Water) recede" , "recession" , "Withdraw heartless" , "Tidal retreat" , "Drain away; decline" .)