Mount a collection of verse (9)
I believe the answer is:
parnassus
This might be a double definition.
'mount a collection' is the first definition.
The definition suggests a singular noun which matches the answer.
'verse' is the second definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?
'of' acts as a link.
Can you help me to learn more?
(Other definitions for parnassus that I've seen before include "Mount sacred to the Muses" , "source of inspiration" , "Greek mountain sacred to Apollo" , "Greek mountain sacred to ancient Muses" , "the height of poetry" .)