Rowena’s husband in one front garden (7)
I believe the answer is:
ivanhoe
'rowena's husband' is the definition.
(in Walter Scott's novel Ivanhoe)
'one front garden' is the wordplay.
'one' becomes 'i' (Roman numeral).
'front' becomes 'van' (I've seen this in other clues).
'garden' becomes 'hoe' (to garden could mean to hoe).
'i'+'van'+'hoe'='IVANHOE'
'in' acts as a link.
(Other definitions for ivanhoe that I've seen before include "Sir Walter Scott hero" , "Book by Sir Walter Scott" , "I have no collection for Walter Scott's famous novel" , "romance" , "Walter Scott's eponymous hero" .)