Pub about to sway with English song (10)
I believe the answer is:
barcarolle
'song' is the definition.
(barcarolle is a kind of song)
'pub about to sway with english' is the wordplay.
'pub about' becomes 'barca' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to sway' becomes 'roll' (I've seen this in another clue).
'with' says to put letters next to each other.
'english' becomes 'E' (abbreviation).
'barca'+'roll'+'e'='BARCAROLLE'
Can you help me to learn more?
(Other definitions for barcarolle that I've seen before include "Gondolier's song" , "musical entertainment" , "Song with liquid associations" , "boating tune" , "musical piece" .)