Kite perhaps was in the air, we hear — other fliers may be sick of it (4,3)
I believe the answer is:
bird flu
'the air we hear other fliers may be sick of it' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'kite perhaps was' is the wordplay.
'kite perhaps' becomes 'bird' (kite is a kind of bird).
'was' becomes 'flu' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bird'+'flu'='BIRD FLU'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for bird flu that I've seen before include "Poultry virus that can spread to humans" , "Avian disease contractible by humans" , "viral disease" , "Avian virus that can spread to humans" .)
