One girl swallowing a drink that's not real (9)
I believe the answer is:
imaginary
'not real' is the definition.
(I've seen this before)
'one girl swallowing a drink' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'girl' could be 'gina' and 'gina' is found within the answer.
'a' is present in the answer.
This explanation may well be incorrect...
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for imaginary that I've seen before include "Not real" , "Fictional" , "Unreal, fanciful" , "Fictitious" , "Pretend" .)