Awfully mean one has the pretty flower (7)
I believe the answer is:
anemone
'the pretty flower' is the definition.
'anemone' can be an answer for 'flower' (anemone is a kind of flower). I'm not certain of the 'the pretty' bit.
'awfully mean one' is the wordplay.
'awfully' indicates an anagram.
'mean' is an anagram of 'anem'.
'anem'+'one'='ANEMONE'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for anemone that I've seen before include "Windflower - sea creature" , "Kind of buttercup with white or coloured flowers" , "Sea creature, also flower" , "Growth" , "Flowering plant - mean one (anag)" .)