Second panel covering the right PC component (11)
I believe the answer is:
motherboard
'pc component' is the definition.
(I know this)
'second panel covering the right' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'panel' becomes 'theboard' (I can't explain this - if you can you should believe this answer much more).
'covering' indicates putting letters inside.
'the right' becomes 'r' (common abbreviation).
'theboard' going around 'r' is 'therboard'.
'mo'+'therboard'='MOTHERBOARD'
(Other definitions for motherboard that I've seen before include "Some PC" , "Item for computer" , "It holds a computer's central printed circuit" , "What holds the main microchips in a computer" .)