Hmmm--do you mean it's missing the guts of its internal rotary magazine, or is he wanting a stripper clip to quick load that magazine?

Or is this not really an MS, but rather a sporter based on the Steyr 1895 action, which would require a clip, but probably wouldn't use 8x56 MS? You can find anything in European custom rifles, but the rimless 8x56MS would be unusual in the 1895- actioned Steyr; most of them would be 8x50R or 8x56R, wouldn't they?

If it's an MS and all the original rifle is there, you don't actually need a clip.

If it's an MS missing its magazine rotor and spring, that could get costly. Someone on the forum may know of a source and whether the rotor is caliber-specific (I.E. can you use the 6.5x54MS rotor for the 8x56? If so, you might look for a military surplus one from Springfield Sporters or someone with Greek military surplus parts).