Puzzle 22

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ClueSolution
letter carriers fill themMAILBOXES
MAILBOXES
eye doctor's fieldOPTOMETRY
OPTOMETRY
one with a quick temperHOTHEAD
HOTHEAD
noticedREMARKED
REMARKED
blackmailEXTORT
EXTORT
questionQUIZ
QUIZ
staff symbolsCLEFS
CLEFS