A European railway's cheating (8)
I believe the answer is:
adultery
'cheating' is the definition.
(I've seen this before)
'a european railway's' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
'european' could be 'e' (abbreviation e.g. EU) and 'e' is present in the answer.
'railway' could be 'ry' (abbreviation for railway) and 'ry' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for adultery that I've seen before include "excluding union involvement?" , "The act of being unfaithful to spouse (8)" , "Extramarital bedroom antics" , "Affairs" , "Seventh Commandment infraction" .)