Some problem ERG expenses come to light (6)
I believe the answer is:
emerge
'come to light' is the definition.
(I've seen this before)
'some problem erg expenses' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'EMERGE' can be found hidden inside 'problem erg expenses'.
(Other definitions for emerge that I've seen before include "Break out (from an egg)" , "Move out and become visible" , "Rise to notice" , "Come into existence" , "Come into view" .)