Smooth clue Mev wrote - satisfaction finally (4)
I believe the answer is:
even
'smooth' is the definition.
(associated in meaning)
'clue mev wrote satisfaction finally' is the wordplay.
'finally' says to take the final letters.
The last letters of 'clue mev wrote satisfaction' are 'EVEN'.
(Other definitions for even that I've seen before include "When darkness starts to fall" , "Smooth, level" , "Flat, smooth and divisible by two" , "Flat, level" , "neck and neck" .)