Answer:

encl

Answer	Crossword Clue
ENCL	Letter abbr.
ENCL	SASE, for one
ENCL	Cover-letter abbr.

ENCL	Business letter abbr.
ENCL	SASE, e.g.
ENCL	Abbr. on a business letter
ENCL	Bus. letter abbr.
ENCL	Env. within an env., perhaps
ENCL	Ltr. insert
ENCL	Ms., often
ENCL	It's inside: Abbr.

ENCL	Letter letters
ENCL	Letter-bottom letters
ENCL	SASE, for example
ENCL	Letter-bottom abbr.
ENCL	Something sent with a ltr.
ENCL	Check sent with a ltr., e.g.
ENCL	Env. stuffer
ENCL	Env. stuffing

ENCL	Env. in an env., e.g.
ENCL	Pkg. insert, e.g.
ENCL	SASE, often
ENCL	Env. thickener
ENCL	SASE, say
ENCL	Letter-ending abbr.
ENCL	Something besides the letter: Abbr.
ENCL	Ltr.-bottom letters

ENCL	Inside: Abbr.
ENCL	Bottom-of-letter abbr.
ENCL	It's inside an env.
ENCL	Env. contents
ENCL	Inside this env.
ENCL	Inside, for short
ENCL	Something in an env.
ENCL	Item that accompanies a business letter: Abbr.

ENCL	In this env.
ENCL	Cover letter accompanier: Abbr.
ENCL	Letter accompanier: Abbr.
ENCL	Business abbreviation.
ENCL	Envelope contents: Abbr.