Adding watery element to eggy drink makes it void (7)
I believe the answer is:
nothing
'void' is the definition.
(I have seen 'A void' mean 'nothing' so perhaps 'void' could also mean 'nothing')
'adding watery element to eggy drink makes it' is the wordplay.
I cannot really see how this works, but
'watery' could be 'thin' (similar in meaning) and 'thin' is found within the answer.
'element' could be 'no' (No is an example) and 'no' is found in the answer.
A single letter 'g' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nothing that I've seen before include "trivial event" , "Item of no importance" , "unimportant or > unintelligible" , "'Zero, zilch (7)'" , "Zilch, nada" .)