Does one necessarily need water wings? (8)
I believe the answer is:
seaplane
'does one necessarily need' is the definition.
I can't tell whether this defines the answer.
'water wings?' is the wordplay.
'water' becomes 'sea' (the sea is water).
'wings?' becomes 'plane' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sea'+'plane'='SEAPLANE'
Can you help me to learn more?
(Other definitions for seaplane that I've seen before include "Marine aircraft" , "Floating aircraft" .)