Put up after with welcome drink (6)
I believe the answer is:
whisky
'drink' is the definition.
(whisky is a kind of drink)
'put up after with welcome' is the wordplay.
'put up' becomes 'sky' (informal term meaning to throw something skyward).
'after' is a charade indicator (letters next to each other).
'with' becomes 'w' (abbreviation).
'welcome' becomes 'hi' (I've seen this in other clues).
'w'+'hi'='whi'
'sky' after 'whi' is 'WHISKY'.
(Other definitions for whisky that I've seen before include "Spirit distilled from malted grain" , "Scottish spirit" , "reportedly available for Thin Lizzy gig?" , "Grain alcohol" , "Scotch" .)