Sell computer fan combined with a light provider (11,4)

'sell computer fan' is the definition.
The definition suggests a singular noun which matches the answer.

'combined with a light provider' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'amp' (A is the symbol for the amp or ampere) and 'amp' is located in the answer.
'light' could be 'fluorescent' (similar in meaning) and 'fluorescent' is located in the answer.
A single letter 'l' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?