Single print has an emotional effect (10)
I believe the answer is:
impression
'single' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'print has an emotional effect' is the wordplay.
'print' becomes 'impress' (synonyms).
'has' is a charade indicator (letters next to each other).
'an emotional effect' becomes 'ion' (I can't justify this - if you can you should believe this answer much more).
'impress'+'ion'='IMPRESSION'
Can you help me to learn more?
(Other definitions for impression that I've seen before include "opinion" , "take-off" , "Imitation (of a person)" , "Feeling; print" , "Mark" .)