Berkshire Town supporter Kevin gutted to be put in prison (9)
I believe the answer is:
bracknell
'berkshire town' is the definition.
(town in Berkshire)
'supporter kevin gutted to be put in prison' is the wordplay.
'supporter' becomes 'bra' (a bra gives support to breasts).
'gutted' means to remove the middle letters (to gut something is to remove its insides).
'to be put in' indicates putting letters inside.
'prison' becomes 'cell' (I've seen this before).
'kevin' with its middle removed is 'kn'.
'kn' going inside 'cell' is 'cknell'.
'bra'+'cknell'='BRACKNELL'
(Other definitions for bracknell that I've seen before include "Town with weather centre - Wilde Lady" , "Town in Berkshire" , "Berks new town" , "Lady - (The Importance of Being Earnest)" .)