Flowers conceal an area of London (10)
I believe the answer is:
bloomsbury
'an area of london' is the definition.
I can't judge whether this defines the answer.
'flowers conceal' is the wordplay.
'flowers' becomes 'blooms' ('bloom' can be a synonym of 'flower').
'conceal' becomes 'bury' (burying is a kind of concealing).
'blooms'+'bury'='BLOOMSBURY'
Can you help me to learn more?
(Other definitions for bloomsbury that I've seen before include "Flowers cover an area of central London" , "Name of Virginia Woolf, Lytton Strachey group" , "part of central London" , "capital area" .)