One in unkempt garden in Berkshire town (7)
I believe the answer is:
reading
'berkshire town' is the definition.
(Reading is a town in Berkshire)
'one in unkempt garden' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'unkempt' indicates an anagram.
'garden' with letters rearranged gives 'readng'.
'i' placed within 'readng' is 'READING'.
'in' is the link.
(Other definitions for reading that I've seen before include "Interpretation (of text); Berkshire town" , "Literacy" , "Passage" , "Town west of London" , "Berkshire town - scholarship" .)