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 subsidiary indication.
'ultimately' suggests the final letters.
'designed' indicates an anagram (designed with the letters).
The last letter of 'perfume' is 'e'.
'moiste' is an anagram of 'tomise'.
'to make' is the link.
(Other definitions for atomise that I've seen before include "Reduce to tiny particles", "Fragment (S, not Z)" and "Reduce to fine particles".)