Perhaps from cley + staff, but ‘more probably’ (according to the OED) from cleek + staff.
"cleystaff." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/cleystaff>.
cleystaff. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/cleystaff
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