I get in fancy light (6)
I believe the answer is:
ignite
'light' is the definition.
(I've seen this before)
'i get in fancy' is the wordplay.
'fancy' is an anagram indicator.
'get'+'in'='getin'
'getin' is an anagram of 'gnite'.
'i'+'gnite'='IGNITE'
(Other definitions for ignite that I've seen before include "Spark off" , "Put a match to" , "Cause to start burning" , "Combust" , "Cause to catch fire" .)