Light rubber and aluminium device extending PC performance (7)
I believe the answer is:
aladdin
'light rubber' is the definition.
(I've seen this before)
'aluminium device extending pc performance' is the wordplay.
I cannot quite see how this works, but
'aluminium' could be 'al' (Al is the chemical symbol for aluminium) and 'al' is found in the answer.
The remaining letters 'addin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'and' acts as a link.
Can you help me to learn more?
(Other definitions for aladdin that I've seen before include "Pantomime character with wonderful lamp" , "Lad with a lamp" , "Common panto title" , "Fictional owner of a magic lamp" , "Pantomime boy with magic lamp" .)