Topless Canterbury pilgrim in some light banter (8)
I believe the answer is:
raillery
'banter' is the definition.
(I know that banter can be written as raillery)
'topless canterbury pilgrim in some light' is the wordplay.
'topless' means to remove the first letter.
'canterbury pilgrim' becomes 'miller' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'some light' becomes 'ray' (ray is a kind of light).
'miller' with its first letter removed is 'iller'.
'iller' put into 'ray' is 'RAILLERY'.
(Other definitions for raillery that I've seen before include "Playful satire" , "(Example of) banter" , "Banter, back-chat" , "Satirical banter" , "Light teasing repartee" .)