Agreeable rustic houses either side of Liverpool (8)
I believe the answer is:
pleasant
'agreeable' is the definition.
('pleasant' can be similar in meaning to 'agreeable')
'rustic houses either side of liverpool' is the wordplay.
'rustic' becomes 'peasant' (peasant is a kind of rustic).
'houses' indicates putting letters inside.
'either side of liverpool' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
'peasant' going around 'l' is 'PLEASANT'.
(Other definitions for pleasant that I've seen before include "A greeable, affable" , "Delightful" , "Likeable, friendly" , "Lovely" , "Charming" .)