From The Enigma
July, 2016
SCARAB

The two answers to this flat differ by the letters WN and S, which are respectively inserted into and added to the second answer - as shown.

A _ _ _ _ _ of kids went out to play
Some volleyball one summer day.
They found a net of perfect height
And planned to play until the night.
Alas, some _ _ _ WN- _ _S spoiled their sport
And made them leave the tennis court.

Answers:

GROUP
GROWN-UPS