(10010050 + 1) ÷ y? It might make your head spin (7)
I believe the answer is:
cyclone
'it might make your head spin' is the definition.
(cyclones spin around)
'10010050 1 y?' is the wordplay.
I cannot quite see how this works, but
'1' could be 'one' (synonyms) and 'one' is found in the answer.
'y?' could be 'y' and 'y' is located in the answer.
The remaining letters 'ccl' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for cyclone that I've seen before include "Violent whirling wind" , "Whirlwind or twister" , "storm in the West Indies, say" , "Hurricane" , "kind of weather?" .)