Moose hit in crash? That's the drink! (8)
I believe the answer is:
smoothie
'the drink' is the definition.
(smoothie is a type of drink)
'moose hit in crash?' is the wordplay.
'in crash?' indicates an anagram (I've seen 'in crash' mean this).
'moose'+'hit'='moosehit'
'moosehit' with letters rearranged gives 'SMOOTHIE'.
'that's' acts as a link.
(Other definitions for smoothie that I've seen before include "Drink made with pureed fruit" , "Plausible person" , "Dairy fruit drink" , "Drink made with pur?ed fruit" , "Thick fruity drink - charmer" .)