I am sick, upset, over relation in naughty relationship (7)
I believe the answer is:
liaison
'relationship' is the definition.
(I know that liaison is a type of sexual relationship)
'i am sick upset over relation in naughty' is the wordplay.
I cannot quite see how this works, but
'i' could be 'a' and 'a' is located in the answer.
'over' could be 'on' (physically on top of) and 'on' is found in the answer.
'relation' could be 's' (S is an example) and 's' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for liaison that I've seen before include "Co-operation; love affair" , "Sort of officer" , "An affair or mediation" , "Usually secretive or illicit relationship" , "Contact between groups" .)