Memos? They may be found in bars (5)
I believe the answer is:
notes
'memos?' is the definition.
(memo is a kind of note)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for notes that I've seen before include "Observes; short comments" , "Jots down" , "output from musicians" , "fivers?" , "Memos; marks" .)