ODD ONE OUT

Each of the words in the list below - except one-  has an unusual property. Can you determine what it is, and identify which word is the odd one out?

BRAWL
CLOVER
PROPER
CARROT
SWING
CHANGE
TRAVEL
SACRED
STONE

HINT:
The odd word out is CARROT.

Answer:
With the exception of CARROT, each word can drop its first and last letter and a valid word remains: