Drink with gritty stuff, hard to get swallowed (6)
I believe the answer is:
shandy
'drink' is the definition.
(shandy is a kind of drink)
'with gritty stuff hard to get swallowed' is the wordplay.
'with gritty stuff' becomes 'sandy'.
'hard' becomes 'h'.
'to get swallowed' indicates putting letters inside.
'sandy' placed around 'h' is 'SHANDY'.
(Other definitions for shandy that I've seen before include "Drink of ale and lemonade 96)" , "Drink made of beer and lemonade" , "Beer and lemonade mixture" , "Beer and lemonade mix" , "Alcohol" .)