Fans weren't impressed by response (6)
I believe the answer is:
answer
'response' is the definition.
(I know that answer is a type of response)
'fans weren't impressed' is the wordplay.
'ANSWER' is hidden within the letters.
However, I'm not sure how this is indicated.
'by' is the link.
Can you help me to learn more?
(Other definitions for answer that I've seen before include "Reaction to a question" , "Fulfil" , "Response to a question" , "'Daisy, Daisy, give me your ...... do'" , "Write back" .)