A moist perfume ultimately designed to make fine spray (7)
I believe the answer is:
Here is my best explanation:
'fine spray' is the definition.
'a moist perfume ultimately designed' is the wordplay.
'ultimately' indicates one should take the final letters.
'designed' indicates an anagram (designed with the letters).
The final letter of 'perfume' is 'e'.
'moiste' with letters rearranged gives 'tomise'.
'to make' is the link.
(Other definitions for atomise that I've seen before include "Destroy", "Fragment (something)", "Fragment (S, not Z)", "Utterly destroy", "Reduce to tiny particles" and "Reduce to fine particles".)