on pro?

thetazuo

Senior Member
Chinese - China
This excerpt is also from the Shining:

"Even lacking that, Al might well convince the Stovington Board to rehire him. He would be on pro of course, maybe for as long as three years, but if he could stay sober and keep writing, he might not have to stay at Stovington for three years.

So what does "on pro" mean?

Thank you.
 
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