Makes noise like Brand and Bertrand, say? (7)
I believe the answer is:
rustles
'makes noise' is the definition.
The answer and definition can be both to do with perception as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?
'brand and bertrand say?' is the wordplay.
'brand' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'bertrand' becomes 'Russell'.
'say?' shows a homophone (sound like) (I've seen 'say' mean this).
'russell' is a homophone of 'rustle'.
's' after 'rustle' is 'RUSTLES'.
'like' is the link.
Can you help me to learn more?
(Another definition for rustles that I've seen is " Steals cattle or sounds like ulsters".)