What do the following words have in common and what is the one word that can apply to all the clue words? Wordplay is fair play.

OUT
EYE
SUB
CAP
GOB
OWL
HAM
STAR
RING 

Answer:

The letters/word CUT can be added at the end of each word to make a new one:

OUTLET, etc.
The word that unites all the clue words is CUTLET (CUT  LET) 

Credit: Joseph Appel - idea based on a puzzle by Lee Glickstein and Nancy Salomon (ADDLED) - posted 9-1-2019