New version of atlas contains listing (6)
I believe the answer is:
aslant
'listing' is the definition.
(I've seen this in another clue)
'new version of atlas contains' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'version of' indicates anagramming the letters (another version of the same letters).
'contains' indicates putting letters inside.
'atlas' with letters rearranged gives 'aslat'.
'n' put within 'aslat' is 'ASLANT'.
(Other definitions for aslant that I've seen before include "At an oblique angle" , "crooked" , "Out of the vertical" , "not on the level" , "sloping away?" .)