The same letters, in the same, consecutive order, will change each word below into a new one.

AID
AIR

EAT
LAY
RISE
TILE
LACE
RESENT

HINTS:
#1: The change involves three letters.
#2: The three letters precede the clue words.

Answers:

Each of the words can be preceded by REP to make a new word:

REPAID
REPAIR
REPEAT
REPLAY
REPRISE
REPTILE
REPLACE
REPRESENT

Credit:
NY Times Crossword
January 1, 2006
Joe DiPietro
AD REPS