It may stop habitual drunkard touring Tamworth, perhaps (6)
I believe the answer is:
spigot
'it may stop habitual' is the definition.
The definition suggests a singular noun which matches the answer.
'drunkard touring tamworth perhaps' is the wordplay.
'drunkard' becomes 'sot' (synonyms).
'touring' means one lot of letters goes inside another (touring can mean going round).
'tamworth perhaps' becomes 'pig' (Tamworth is a breed of pig).
'sot' placed around 'pig' is 'SPIGOT'.
(Other definitions for spigot that I've seen before include "Peg - plug - tap" , "Device for stopping" , "Vent hole peg - US tap" , "Peg that stops the vent of a cask" , "Peg to control the flow of a tap" .)