A measure used to ban pet loos, perhaps (10)
I believe the answer is:
tablespoon
'a measure' is the definition.
(tablespoon is a kind of measure)
'to ban pet loos perhaps' is the wordplay.
'perhaps' indicates an anagram.
'ban'+'pet'+'loos'='banpetloos'
'banpetloos' with letters rearranged gives 'TABLESPOON'.
'used' is the link.
(Other definitions for tablespoon that I've seen before include "Piece of cutlery" , "server" , "One serves with this" , "Item of cutlery" .)