Answer:

OPER

Answer	Crossword Clue
OPER	Phone (abbr.)
OPER	Telephone abbr.
OPER	Letters over a zero

OPER	Phone-button letters
OPER	Abbr. near a zero
OPER	Telephone keypad abbr.
OPER	Phone abbr.
OPER	Phone button abbr.
OPER	Telephone button abbr.
OPER	Phone button ltrs.
OPER	Switchboard pers.

OPER	Phone co. helper
OPER	Letters on a phone's "0" button
OPER	Phone co. employee
OPER	Phone key letters
OPER	Abbr. on a phone's "0" button
OPER	Letters near zero, at times
OPER	Letters near zero?
OPER	"0" button letters

OPER	Phone button letters
OPER	Letters on a phone button
OPER	Letters under TUV, on many phones
OPER	It's below TUV on a phone
OPER	Abbr. on a telephone
OPER	Letters above a zero
OPER	Letters near 0
OPER	Abbr. on a phone

OPER	Phone button below 8
OPER	Letters with 0
OPER	Switchboard worker (abbr.)
OPER	Letters associated with 0
OPER	Letters near 0 on a phone
OPER	Letters above 0
OPER	Letters on a phone's zero
OPER	AT and T employee

OPER	Phone button
OPER	Letters under TUV, perhaps
OPER	TUV neighbor on some phones
OPER	Abbr. on your Ameche
OPER	Telephonic abbr.