Answer: enc

AnswerCrossword Clue
ENCLtr. extra
ENCDoc. with a ltr.
ENCEnv. in an env., say
ENCLetter-bottom abbr.
ENCCover letter letters
ENCCause of an env. bulge
ENCIn this pkg.
ENCIt comes in vols.
ENCBottom-of-letter abbr.
ENCLetter inclusion, briefly
ENCLarge ref. work
ENCCompton's, for one: Abbr.
ENCAbbr. on a cover letter
ENCAbbr. under a signature
ENCBus. letter extra
ENCEnv. stuffer
ENCRSVP, e.g.
ENCEnv. extra
ENCResearch tool (abbr.)
ENCWedding RSVP, e.g.
ENCAccompanier of a letter inside an env.
ENCBus. letter abbr.
ENCBusiness abbr.
ENCRef. wk.
ENCSASE, e.g.
ENCSASE, often
ENCRef. work
ENCRef. book
ENCIn an env.
ENCIn the env.
ENCEnv. insertion
ENCAbbr. in a letter
ENCBusiness letter abbr.
ENCSASE, for example
ENCAddl. item in an envelope
ENCSASE, perhaps: Abbr.
ENCAddl. document in an envelope
ENCIt may support a written claim: Abbr.
ENCSASE, for one
ENCIt may be a copy of a ck.