Not any neon was used (4)
I believe the answer is:
none
'not any' is the definition.
(I've seen this in another clue)
'neon was used' is the wordplay.
'neon' anagrams to 'NONE'.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for none that I've seen before include "office" , "hour of prayer" , "Not a single person" , "Not a sausage" , "Nobody - nothing" .)