If this is a home game tourney then you should set the rule on who can call clock and when.

In our home tourneys the rule is that any player actively involved in the hand or the button can call clock, and after that the called player has 20 seconds to act.

However this is very rarely used and the purpose it was set in is to prevent a player from purposely slowing the game and having the blinds increase, and not to force players to make rush decisions