Introduce fashionable whisky-maker — only one left! (6)
I believe the answer is:
instil
'introduce fashionable whisky' is the definition.
'instil' can be an answer for 'introduce' (instilling is a kind of introducing). I'm not certain of the 'fashionable whisky' bit.
'maker only one left' is the wordplay.
'maker only' becomes 'inst' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one' becomes 'I' (Roman numeral).
'left' becomes 'l' (common abbreviation).
'inst'+'i'+'l'='INSTIL'
(Other definitions for instil that I've seen before include "Infuse (something) slowly into the mind" , "Drill" , "Impress" , "Inject as in list" , "Put in drop by drop" .)