Return for spell in shed (4)

I believe the answer is:

emit

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

I cannot understand how the rest of the clue works.

(Other definitions for emit that I've seen before include "Send forth" , "Give off, heat say" , "Sent" , "Conductor; telegram (US)" , "Release" .)

I've seen this clue in The Telegraph.

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