Old reports about Ursula's first bloomers (7)
I believe the answer is:
Here is my best explanation:
'bloomers' is the definition.
(annually blooming plants)
'old reports about ursula's first' is the wordplay.
'old reports' becomes 'annals' (historical records).
'about' indicates putting letters inside.
'first' says to take the initial letters.
The initial letter of 'ursulas' is 'u'.
'annals' going around 'u' is 'ANNUALS'.
(Other definitions for annuals that I've seen before include "regular books", "Books published once a year", "Yearly books", "which one may enjoy in bed?", "Yearly plants", "Yearly publications", "Yearbooks", "regular publications" and "Plants that have only one season".)