Light payments, about a pound? (6)
I believe the answer is:
flares
'light payments about a pound?' is the definition.
I can't judge whether this definition defines the answer.
'payments about a pound?' is the wordplay.
'payments' becomes 'fares' (I am not sure about this - if you are sure you should believe this answer much more).
'about' is an insertion indicator.
'a pound?' becomes 'L' (abbreviation e.g. Lsd - pounds, shillings, pence).
'fares' placed around 'l' is 'FLARES'.
Can you help me to learn more?
(Other definitions for flares that I've seen before include "Bell-bottom trousers" , "Devices producing bright lights as signal" , "Distress lights" , "Bursts of bright lights and a trouser style" , "Blazes of light" .)