Answer: saes

AnswerCrossword Clue
SAESEnclosures with many bills (abbr.)
SAESWriters' supplies, briefly
SAESMail-order encls.
SAESFreelancers' encls.
SAESFifty forming one
SAESWriter's supply: Abbr.
SAESRequests from an ed.
SAESMailing encls.
SAESSome letter enclosures, abbr.
SAESEnclosures to an ed.