Rail, perhaps: one to put in shed (3,3)
I believe the answer is:
hit out
'rail perhaps' is the definition.
(to rail is to hit out angrily)
'one to put in shed' is the wordplay.
'one' becomes 'i' (Roman numeral).
'put in' indicates putting letters inside.
'shed' becomes 'hut' (I've seen this before).
'i'+'to'='ito'
'ito' going inside 'hut' is 'HIT OUT'.
(Other definitions for hit out that I've seen before include "Make a strong attack" , "Aim a blow, perhaps in self-defence" , "Be severely critical of" , "Launch a verbal attack" , "Throw a punch" .)