They’re blooming pleased to get the ten fifty-one! (8)
I believe the answer is:
gladioli
'they're blooming' is the definition.
The definition suggests an adverb but the answer is not.
'pleased to get the ten fifty-one' is the wordplay.
'pleased' becomes 'glad' ('glad' can be similar in meaning to 'pleased').
'to get' says to put letters next to each other.
'the ten' becomes 'io'.
'fifty one' becomes 'li' (Roman numeral).
'glad'+'io'+'li'='GLADIOLI'
Can you help me to learn more?
(Other definitions for gladioli that I've seen before include "Plant with brightly coloured, funnel-shaped flowers" , "Garden flowers of the iris family" , "Garden plants of the iris family" , "Did the Iliad log out these flowers?" , "bloomers!" .)