Settle on a lamp, perhaps (6)
I believe the answer is:
alight
'settle' is the definition.
(I've seen this before)
'on a lamp perhaps' is the wordplay.
'on' means one lot of letters go next to another.
'lamp perhaps' becomes 'light' (lamp is a kind of light).
'a'+'light' is 'ALIGHT'.
(Other definitions for alight that I've seen before include "Descend from vehicle" , "(Of bird) settle" , "staying in?" , "Land; burning" , "Get down from, say bus" .)