Enclosure outside old abstainer’s rural dwelling (7)
I believe the answer is:
cottage
'rural dwelling' is the definition.
(I've seen this before)
'enclosure outside old abstainer's' is the wordplay.
'enclosure' becomes 'cage' (cage is a kind of enclosure**).
'outside' is an insertion indicator.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'abstainer' becomes 'tt' (I've seen this in other clues).
'o'+'tt'='ott'
'cage' placed around 'ott' is 'COTTAGE'.
(Other definitions for cottage that I've seen before include "Modest accommodation" , "Small one-storied house" , "Cheese pie industries all may chase this" , "Small house, in the country say" , "building" .)