1) Behind the line of scrimmage 2) Football kick 3) In a legal line position 4) In position for a legal play 5) Kind of a kick 6) Kind of football kick 7) Kind of kick 8) Kind of kick in football 9) Kind of surprise kick 10) Legal football maneuver 11) Legal football play 12) Like a certain football kick Found on https://www.crosswordclues.com/clue/onside
Legally positioned at the kick-off or the snap. On kick-offs, members of the kicking team must be behind the kick-off line; members of the receiving must be at least 10 yards from the kick-off line. On scrimmages, at the snap the offence must be behind the line of scrimmage; the defence must be at least one yard beyond the line of scrimmage. A play... Found on http://www.translationdirectory.com/glossaries/glossary156.htm