Trick male campers over square happiness (11)
I believe the answer is:
contentment
'happiness' is the definition.
(I know that happiness can be written as contentment)
'trick male campers over square' is the wordplay.
I cannot quite understand how this works, but
'trick' could be 'con' (I've seen this before) and 'con' is located in the answer.
'male' could be 'm' (common abbreviation) and 'm' is located in the answer.
'square' could be 't' (a T-Square is a technical drawing instrument) and 't' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for contentment that I've seen before include "State of peaceful happiness" , "peace of mind" , "Comfort" , "pleasure" , "Satisfaction" .)