Perfect copy with small shed to keep computer (10)
I believe the answer is:
immaculate
'perfect' is the definition.
(I've seen this before)
'copy with small shed to keep computer' is the wordplay.
I cannot quite see how this works, but
'computer' could be 'mac' (Apple Mac computer) and 'mac' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for immaculate that I've seen before include "Dogma that the unborn Virgin Mary was preserved from all original sin" , "Free from flaws" , "Spotless" , "Faultless" , "conception of a particular religion?" .)