Robin Goodfellow pushing stock from the banks (4)

I believe the answer is:

puck

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'robin goodfellow' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for puck that I've seen before include "Fairy - ice hockey "ball"" , "Shakespearean fairy" , "Mischievous character" , "gets knocked about with sticks" , "In plentiful supply" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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