Wedding bouquet's first delivered by little Albert (6)
I believe the answer is:
bridal
'wedding' is the definition.
(bridal is a kind of wedding)
'bouquet's first delivered by little albert' is the wordplay.
'bouquet's first' becomes 'b' (1st letter of 'bouquet').
'delivered' becomes 'rid' (as in ridding or delivering someone of something).
'by' says to put letters next to each other.
'little albert' becomes 'al' (short form of the name).
'b'+'rid'+'al'='BRIDAL'
(Other definitions for bridal that I've seen before include "Hotel suite for newly-weds" , "The suite for the honeymooners" , "Nuptial" , "Relating to a newly married woman" , "Woman in White" .)