Proviron is an androgen, but shouldnt effect clomid actions to much. Arimidex or something similar would be a better choice, but proviron would help with the estrogen conversion.
I can post the absract, but there was a absract posted about proviron that was done on 440 males who were given either a 100mg dose or a 200mg of proviron for 1 year. The % of men whose HPTA were supressed( not shut down ) was 8% on the 100mg dose and 17% on the 200mg dose. Now that was a year of continueous administration and only a low % were effectived.
As you can see its not that strong of an androgen and shouldnt effect the actions of clomid a great deal.
I'm not trying to sway anyone, but show proviron androgenic properties to be very weak.