Fiendish objective? (3)
I believe the answer is:
end
'objective?' is the definition.
(both can mean a purpose)
'fiendish' is the wordplay.
'END' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for end that I've seen before include "Concluding purpose" , "Aim; stop" , "Extremity" , "For Chelsea or Villa, it's a" , "Goal; leftover" .)