Settle for some illumination? (6)
I believe the answer is:
alight
'settle' is the definition.
(I've seen this before)
'some illumination?' is the wordplay.
'some' becomes 'a' ().
'illumination?' becomes 'light' ('light' can be a synonym of 'illumination').
'a'+'light'='ALIGHT'
'for' acts as a link.
(Other definitions for alight that I've seen before include "Dismount" , "Come to rest on the ground" , "Small restaurant" , "Burning; descend" , "staying in?" .)