Use a PC (6)

I believe the answer is:

copper

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

'use a' is the wordplay.
'use' becomes 'cop' (I can't explain this - if you can you should believe this answer much more).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'cop'+'per'='COPPER'

Can you help me to learn more?

(Other definitions for copper that I've seen before include "detector?" , "Metal - police officer" , "Metal - washing-machine?" , "Metal, Cu" , "A reddish-brown metal" .)

I've seen this clue in The Sunday Times and The Times.

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