The fluid from the clutch is leaking
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You need to find where the leak is coming from, the clutch master cylinder, the line and or the clutch slave cylinder etc, the slave cylinder is in the bell housing as it is part of the throw-out bearing assembly, and the transmission has to come out to replace it, at that point it is recommended to just put a complete clutch kit in it, and I would do the clutch master cylinder while at it…
But remember that the clutch system also has a remote reservoir, not sure if separate or part of the brake master reservoir, but it can leak anywhere from the reservoir to the slave cylinder…
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Why would a manufacturer place the slave cylinder inside the bell housing, when replacing an external slave cylinder is so very easy…$20 and it is a DIY-er project?
The mechanic who replaced my inside-the-bell-housing slave on my 1995 Mazda B2300 actually gave me the old clutch because it had lots of remaining life. I pitched it, because the labor costs to replace are ridiculous.
Your Mazda is just a rebadged Ranger as you know, seems like the big 3 like to use internal slaves, while imports seem to like external slaves… Haven’t really paid attention to it but that just came to mind… 
Honestly I don’t think about stuff like that to much, I just do the work…