Erica of Hampstead (5)
I believe the answer is:
heath
This might be a double definition.
'erica' is the first definition.
(I've seen this in another clue)
'hampstead' is the second definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?
'of' acts as a link.
Can you help me to learn more?
(Other definitions for heath that I've seen before include "Barren open country" , "Moor" , "Scrub" , "Ted - - (former PM)" , "Moorland shrub" .)