‘Bowling round the clock’ means always delivering one’s bowl either forehand or backhand. This results in bowling one side of the rink for the odd ends and the other side of the rink for the even ends.
Many lawn bowls instruction or coaching materials discourage this practice. For example:
Do not play “around the clock”, …. the variation does not allow the greatest consistency, and the team will be disadvantaged, and head-building will be adversely affected.
After the first two or three ends, choose the side of the rink that is playing evenly in pace and green, and thus gain a tactical advantage over an opponent who bowls “around the clock”.
It is not recommended to bowl “around the clock”…. as the grass is usually different on each side and so too can be the pace.
You should avoid playing “around the clock,” …. because this promotes inconsistency as you are effectively playing both sides instead of the most favorable one.
None of this makes any sense at all to me. A lawn bowling rink might be tilted or flat. It might play to an even weight on both sides or be different in this respect. It might have ridges that disturb bowls in some locations and not others. But whatever its characteristics, your starting assumption should always be that for odd ends it will play in some characteristic fashion and for even ends in another characteristic fashion. You will be better off to take as your starting hypothesis that you are playing on two separate rinks; one in a first direction and a second in the second direction.
Your proper challenge is to find, as quickly as possible, which side is best for the odd ends and which side is best for the even ends. Then, whether it results in playing one side of the rink preponderantly or playing ‘round the clock’ more often, that should become your tactical choice.