Put down as a poem (3)
I believe the answer is:
lay
I believe this is a double definition.
'put down' is the first definition.
(lay something down)
'a poem' is the second definition.
(I know that lay is a type of poem)
'as' is the link.
(Other definitions for lay that I've seen before include "like a minister? On the contrary" , "Not ordained into clergy" , "Non-professional - ballad" , "located" , "gamble" .)