Turn the light on and I'll think about it (3,2,3)
I believe the answer is:
let me see
'i'll think about it' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for let me see that I've seen before include "I'd like to have a look at that" , "I'm thinking, allow me to visualise" , "I need to think - I want to look" , "Um..." , "Permit me to observe - I'm thinking" .)