Drag up in magazine bad ending to what cheat did to lover
I believe the answer is:
two-timed
'bad ending to what cheat did to lover' is the definition.
I can't judge whether this defines the answer.
'drag up in magazine' is the wordplay.
'drag' becomes 'tow' (towing is a kind of dragging).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'in' indicates putting letters inside.
'magazine' becomes 'timed' (I can't justify this - if you can you should believe this answer much more).
'tow' back-to-front is 'wot'.
'wot' going within 'timed' is 'TWO-TIMED'.
Can you help me to learn more?
(Another definition for two-timed that I've seen is " Was unfaithful or double-crossed".)