Brian is given the freedom to blossom (3)
I believe the answer is:
may
'blossom' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for may that I've seen before include "plant that's tropical making comeback" , "Girl's name; 10 ac (anag.)" , "Month; hawthorn" , "Spring" , "Hawthorn blossom" .)