Exhausted, note, and visibly embarrassed (5)
I believe the answer is:
tired
'exhausted' is the definition.
('tired' can be similar in meaning to 'exhausted')
'note and visibly embarrassed' is the wordplay.
'note' becomes 'ti' (I've seen this in other clues**).
'and' means one lot of letters go next to another.
'visibly embarrassed' becomes 'red'.
'ti'+'red'='TIRED'
(Other definitions for tired that I've seen before include "Are American cars so" , "Zonked" , "knackered" , "Sleepy" , "getting bored" .)