Support for a beverage, say (3)
I believe the answer is:
tee
'support' is the definition.
(I know that tee is a type of support)
'beverage say' is the wordplay.
'beverage' becomes 'tea' (tea is a kind of beverage).
'say' shows a homophone (sound like).
'tea' is a homophone of 'TEE'.
'for a' is the link.
(Other definitions for tee that I've seen before include "support of leisure activity" , "Golfing equipment" , "Golfer's starting point" , "Start of a hole in golf" , "Golf-peg" .)