Replace drink with tea, perhaps (8)
I believe the answer is:
supplant
'replace' is the definition.
(I know that replace can be written as supplant)
'drink with tea perhaps' is the wordplay.
'drink' becomes 'sup' (to sup is to drink).
'with' is a charade indicator (letters next to each other).
'tea perhaps' becomes 'plant' (tea is a kind of plant).
'sup'+'plant'='SUPPLANT'
(Other definitions for supplant that I've seen before include "Supersede and replace" , "Oust" , "take another's place" , "Displace" .)