Crossword Clue:

Sign up to serve

Answer	Crossword Clue
ENLIST	Sign up to serve
ENLISTS	Signs up to serve
SUNNYSIDE	Way to serve eggs (with "up").

ENTER	Sign up to compete
RECRUIT	Try to sign up
ENROL	Sign up, to Brits
TIL	Up to, on a store sign
OPTIN	Sign up to receive email alerts, say