Key worker paints badly round one (7)
I believe the answer is:
pianist
'key worker' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'paints badly round one' is the wordplay.
'badly' indicates an anagram.
'round' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'paints' is an anagram of 'pianst'.
'pianst' placed around 'i' is 'PIANIST'.
Can you help me to learn more?
(Other definitions for pianist that I've seen before include "Ivories tinkler" , "Key worker," , "Instrumentalist" , "Keyboard player" , "Musician" .)