Small garden in Oxford? (4)
I believe the answer is:
shoe
'oxford?' is the definition.
(oxford is a kind of shoe)
'small garden' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'garden' becomes 'hoe' (to garden could mean to hoe).
's'+'hoe'='SHOE'
'in' is the link.
(Other definitions for shoe that I've seen before include "pump, say" , "Item of footwear" , "Slingback, for example" , "something afoot" , "What's worn" .)