In place of whiskey, have this (5)
I believe the answer is:
where
'in place of' is the definition.
(I've seen this before)
'whiskey have this' is the wordplay.
'whiskey' becomes 'W' (alpha bravo charlie delta ...).
'have this' becomes 'here' (I've seen this in another clue).
'w'+'here'='WHERE'
(Other definitions for where that I've seen before include "At which point" , "A question of place?" , "enquiry" , "In which position?" , "a question of location" .)