Shed was adequate for storing small wheels (7)
I believe the answer is:
discard
'shed' is the definition.
(I've seen this before)
'adequate for storing small wheels' is the wordplay.
'adequate for' becomes 'did' (I am not sure about this - if you are sure you should believe this answer much more).
'storing' means one lot of letters goes inside another.
'small' becomes 's' (abbreviation - e.g. clothes size).
'wheels' becomes 'car' (car wheel is a kind of wheel).
's'+'car'='scar'
'did' going around 'scar' is 'DISCARD'.
'was' is the link.
Can you help me to learn more?
(Other definitions for discard that I've seen before include "Shed" , "Abandon" , "Get rid of" , "Jettison" , "bin" .)