Ahead of schedule Crossword Clue

 The answer to the crossword clue "Ahead of schedule" is EARLY. It is a 5-letter word that means before the expected or usual time.

The word "early" is derived from the Old English word "ær", which also means "before".

Here are some other words that can be used to complete the crossword clue:

PREMATURE

PRECOCIOUS

PROMPT

TIMELY

UNDELAYED

I hope this helps!