Brief affirmation of artistry (3)
I believe the answer is:
tis
'brief affirmation' is the definition.
Although both the answer and 'affirmation' are nouns, they are not in the same form of the noun.
'of artistry' is the wordplay.
'of' indicates a hidden word.
'TIS' is hidden within 'artistry'.
Can you help me to learn more?
(Other definitions for tis that I've seen before include "Pacific trees" , "For poet, that's" , "It is shortened" , "Contraction of it is" , "McCourt work" .)