From The Enigma
NPL Magazine
June, 2017
GROUCHO

The key words SHORTER and LONGER represent the two answer words to this flat, and differ by a single additional letter in LONGER. The first two letters of the words are the same.

The reason that little brat is SHORTER when
   he doesn't get his way?
He's just a big spoiled LONGER - and
  there's nothing more to say.

HINTS:
#1: The first two letters of the words are CR
#2: CR _ _ _ _
      CR _ _ _ _ _

Answers:

CRABBY
CRYBABY