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' is an insertion indicator.
'some light' becomes 'ray' (ray is a kind of light).
'miller' with its initial letter taken away is 'iller'.
'iller' put within '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" .)