The Collaborative International Dictionary of English v.0.48:

Scorse \Scorse\ (? or ?), n. [Cf. It. scorsa a course, and E.
   discourse.]
   Barter; exchange; trade. [Obs.]
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         And recompensed them with a better scorse. --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Scorse \Scorse\, v. t. [Written also scourse, and scoss.]
   1. To barter or exchange. [Obs.] --Spenser.
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   2. To chase. [Obs.] --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Scorse \Scorse\, v. i.
   To deal for the purchase of anything; to practice barter.
   [Obs.] --B. Jonson.
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