Light that is surrounding good egg (6)
I believe the answer is:
ignite
'light' is the definition.
(I know that light is a more specific form of the action ignite)
'that is surrounding good egg' is the wordplay.
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'surrounding' is an insertion indicator.
'good' becomes 'g' (abbreviation).
'egg' becomes 'nit' (a nit is an insect egg).
'g'+'nit'='gnit'
'ie' enclosing 'gnit' is 'IGNITE'.
(Other definitions for ignite that I've seen before include "Torch" , "Kindle Fire" , "Detonate" , "Burn" , "Cause to catch fire" .)