Type of poem (6)
I believe the answer is:
sonnet
'type of poem' is the definition.
(I know that sonnet is a type of poem)
This is all the clue.
(Other definitions for sonnet that I've seen before include "Fourteen-lined verse" , "A form of poetry" , "Fourteen-lined poem" , "Poetic fourteen-liner" , "The poem was sent on" .)