Touching displays of affection (6)
I believe the answer is:
kisses
'affection' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.
'touching displays' is the wordplay.
'touching' becomes 'kiss' (kiss is a kind of touching).
'displays' becomes 'es' (I can't explain this - if you can you should believe this answer much more).
'kiss'+'es'='KISSES'
'of' is the link.
Can you help me to learn more?
(Other definitions for kisses that I've seen before include "Light touches" , "Smackers" , "Osculations" , "Osculates" , "caresses" .)