PALINDROME ADDITION

From The Enigma
NPL Magazine
February, 2020
NEWROW

In this flat, the first solution word can be expanded so that a three-letter palindromic string can be inserted into it to answer the second solution word.

'DRAW!" was the _ _ _ _ _,
And the _ _ _ _ _ _ _ _ began.

HINTS:
1. It's an old west gunfight.
2. (BIG HINT) The first solution word is SHOUT.

Answer:

The palindromic string is OTO. 

SHOUT

SHO - OTO - UT = SHOOTOUT