Suffix with gazillion (4)
I believe the answer is:
aire
'suffix with gazillion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aire that I've seen before include "Major river of Yorkshire" , "flower of Yorkshire" , "Northern English river, tributary of the Ouse" , "English flower" , "Terrier -- Yorkshire area" .)