Setting for pub: middle of field (6)
I believe the answer is:
locale
'setting' is the definition.
(I know that locale is a type of setting)
'pub middle of field' is the wordplay.
'pub' becomes 'local' (one's local pub).
'middle of' says to take the centre.
The central letter of 'field' is 'e'.
'local'+'e'='LOCALE'
'for' is the link.
(Other definitions for locale that I've seen before include "Area connected with event" , "Place (of an event)" , "Setting" , "Spot" , "Venue" .)