Boring spies with very standard way of talking back (7)
I believe the answer is:
prosaic
'boring' is the definition.
(prosaic can mean boring or ordinary)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for prosaic that I've seen before include "Hackneyed" , "Lacking originality" , "Mundane" , "Workaday" , "uninspired" .)