Reportedly light up a south coast resort (8)
I believe the answer is:
brighton
'a south coast resort' is the definition.
(I've seen this before)
'reportedly light up' is the wordplay.
I cannot quite see how this works, but
'light' could be 'bright' (similar in meaning) and 'bright' is found within the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for brighton that I've seen before include "Sussex coastal resort" , "South-coast resort" , "Sussex seaside resort" , "Graham Greene wrote ` `........ Rock' '" , "East Sussex resort" .)