Bug ranges around India, at first having travelled rapidly on the air (7,3)
I believe the answer is:
spanish flu
'ranges around india at first having travelled rapidly on the air' is the definition.
I know nothing about this answer so I can't tell whether this works.
'bug' is the wordplay.
I cannot really understand how this works, but
'bug' could be 'flu' and 'flu' is present in the answer.
The remaining letters 'spanish' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for spanish flu that I've seen is " Cause of 1918 pandemic".)