Diverse city, large, frenzied according to an Eastender (8)
I believe the answer is:
eclectic
'diverse' is the definition.
(I've seen this before)
'city large frenzied according to an eastender' is the wordplay.
I cannot quite see how this works, but
'city' could be 'ec' (postcode for the City of London) and 'ec' is present in the answer.
'large' could be 'l' (eg in clothes sizes) and 'l' is found in the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for eclectic that I've seen before include "Accepting beliefs or ideas from various sources" , "Drawn from many sources" , "Choosing or accepting beliefs or material from several sources" , "Choosing or accepting ideas etc from many sources" , "Involving various styles or ideas" .)