Guide to live with a cheat (6)
I believe the answer is:
beacon
'guide' is the definition.
(beaconing is a kind of guiding)
'live with a cheat' is the wordplay.
'live' becomes 'be' (synonyms).
'with' means one lot of letters go next to another.
'cheat' becomes 'con' (con is a kind of cheat).
'be'+'a'+'con'='BEACON'
'to' is the link.
(Other definitions for beacon that I've seen before include "Hill fire seen from a distance" , "Raised signal fire or light" , "Directional transmitter" , "Signal fire - transmitter" , "Signal light on hill" .)