Band follows Blanchett, providing food (8)
I believe the answer is:
catering
'providing food' is the definition.
'band follows blanchett' is the wordplay.
'band' becomes 'ring' (a ring is a band of metal).
'follows' means one lot of letters go next to another.
'blanchett' becomes 'cate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ring' after 'cate' is 'CATERING'.
Can you help me to learn more?
(Other definitions for catering that I've seen before include "activity at event" , "provision of food" , "The supplying of meals" , "Providing food and services" , "essential feature of the tourist industry" .)