New cuddle with ex ruled out (8)
I believe the answer is:
excluded
'ruled out' is the definition.
(I've seen this before)
'new cuddle with ex' is the wordplay.
'new' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'cuddle' anagrammed gives 'cluded'.
'cluded' put after 'ex' is 'EXCLUDED'.
(Other definitions for excluded that I've seen before include "Kept out from place or group" , "'Debarred, shut out (8)'" , "Ruled out" , "Left out" , "Denied access" .)