Heads off tippler's excessive alcoholic tendency, attachment to bottle (4)
I believe the answer is:
teat
'attachment to bottle' is the definition.
(baby's bottle)
'heads off tippler's excessive alcoholic tendency' is the wordplay.
'heads off' indicates taking the first letters (I've seen 'head off' mean this).
The initial letters of 'tipplers excessive alcoholic tendency' is 'TEAT'.
(Other definitions for teat that I've seen before include "Piece on baby's bottle" , "Bulb on infant's bottle" , "Nipple or dug" , "essential for babies" , "Part of feeding bottle" .)