1) At the start, not allowed TV 2) Beginning 3) Beginning or start 4) Commencement 5) Dawn 6) Day one 7) First 8) Get-go 9) Inception 10) Initial start 11) Kickoff 12) Offset 13) Origin 14) Outsert 15) Point 16) Point in time 17) Showtime 18) Square one 19) Start 20) Start of a journey 21) Start unacceptable group Found on https://www.crosswordclues.com/clue/outset
Out'set` noun A setting out, starting, or beginning. 'The outset of a political journey.' Burke. « Giving a proper direction to this outset of life.» J. Hawes. Found on http://www.encyclo.co.uk/webster/O/46