I tell our club organiser I support shorter meetings, then stay silent when she proposes them

After the meeting, I told the organiser she'd made a good point. She said, 'It would have helped to hear that in the room.'

Our small club keeps extending meetings. I would prefer them to end at the time we agreed. Before the latest one, I told the organiser I supported her idea of a shorter agenda. When she proposed it, two people objected and I stared at my notes. She didn't claim to speak for me, and I didn't correct anyone. I simply let her look like the only person who wanted the change.

Then I privately complained that the meeting ran late again.

How do I apologize without promising to become fearless in every discussion? I want my support to mean something more than agreement she can only hear after everybody else has gone home.