Enclosure outside old abstainer’s rural dwelling (7)
I believe the answer is:
Here is my best explanation:
'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' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'abstainer' becomes 'tt' (I've seen this in other clues).
'cage' enclosing 'ott' is 'cottage'.
(Other definitions for cottage that I've seen before include "country residence", "Small home", "Cheese pie industries all may chase this", "simple accommodation", "Small house, in the country say", "Small house with a single storey", "Country residence", "Country dwelling", "small house" and "Small single-storey dwelling".)