Open MP3 in PT
Use ACW to create a tempo map.

Insert one measure of click notes and copy/paste however many bars you want of it (repetitions).

I have a MIDI file of a 100 bar click. It's called Click.mid and is 100 bars of side stick on every beat. It plays at whatever the project Tempo is.
So I'll usually use ACW to make a tempo map, use Load Scrap or any other way to paste this MIDI click to a blank track.

Then I often convert it to an audio track so I can easily control the volume (meaning crank it up for the drummer's feed; PGPeaklimit is quite enough for most needs).

I do not work here, but the benefits are still awesome
Make your sound your own!