Brother entertained by the divine George is a flowery type (4,6)
I believe the answer is:
herb robert
'a flowery type' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'brother entertained by the divine george' is the wordplay.
'brother' becomes 'bro' (short for brother).
'entertained by' indicates putting letters inside (inserted letters are hosted or entertained).
'the divine george' becomes 'herbert' (I can't explain this - if you can you should believe this answer much more).
'bro' put within 'herbert' is 'HERB ROBERT'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for herb robert that I've seen before include "Wayside plant with small red flowers" , "Stinking cranesbill" , "A pungent cranesbill" .)