Densest, inaccessible piece of poetry (7)
I believe the answer is:
sestina
'poetry' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'densest inaccessible piece' is the wordplay.
'piece' says the answer is hidden in the clue.
'SESTINA' is hidden within 'densest inaccessible'.
'of' is the link.
Can you help me to learn more?
(Other definitions for sestina that I've seen before include "Form of poem" , "six-line stanza" , "poetic structure" , "Bit of poetry" , "Old verse form" .)