Following one more listen, I conclude this... The sound is more of a "pat" than a "click," and I would expect clicking from a metronome. Also, the pats enter at a specific, logical point in the song; a metronome would be present from beginning to end, no? What could produce the pats? I'm inclined to believe it's the palms of someone's hands, doing a light clap for the beat. So that's my final answer: it's merely gentle clapping!
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