Sundry poems covered by princess (7)
I believe the answer is:
diverse
'sundry' is the definition.
(I've seen this before)
'poems covered by princess' is the wordplay.
'poems' becomes 'verse' (I've seen this before).
'covered by' says to put letters next to each other (on top of in a down clue).
'princess' becomes 'di' (Princess Diana).
'verse' after 'di' is 'DIVERSE'.
(Other definitions for diverse that I've seen before include "Several" , "Book" , "Showing variety" , "Revised, being of different kinds" , "Sundry" .)