Also shy about drink (6)
I believe the answer is:
shandy
'drink' is the definition.
(shandy is a kind of drink)
'also shy about' is the wordplay.
'also' becomes 'and' (I've seen this before).
'about' is an insertion indicator.
'and' inserted within 'shy' is 'SHANDY'.
(Other definitions for shandy that I've seen before include "Beer and lemonade mixture" , "Beer-lemonade mix" , "Lemonade-beer drink" , "Beer/lemonade drink" , "Beer and lemonade mix" .)