Flung one into the shed (5)
I believe the answer is:
shied
'flung' is the definition.
(I've seen this in another clue)
'one into the shed' is the wordplay.
'one' becomes 'i' (Roman numeral).
'into' means one lot of letters goes inside another.
'i' going inside 'shed' is 'SHIED'.
(Other definitions for shied that I've seen before include "Thrown" , "started" , "Jumped nervously; threw" , "Cast" , "Flung, tossed" .)