Tosses around doubtful drinks (9)
I believe the answer is:
smoothies
'drinks' is the definition.
(smoothie is a type of drink)
'tosses around doubtful' is the wordplay.
'tosses' becomes 'shies' (I can't justify this - if you can you should believe this answer much more).
'around' is an insertion indicator.
'doubtful' becomes 'moot' (I've seen this in another clue).
'shies' going around 'moot' is 'SMOOTHIES'.
Can you help me to learn more?
(Other definitions for smoothies that I've seen before include "They're thick" , "Drinks of pureed fruit" .)