Extremely devious setter's rising in value — Logodaedalus, say (9)
Definition
Logodaedalus, say
Explanation
[ 1st and last letters of ( Extremely ) “ devious ” + reversal of ( …’s rising ) I’M(setter is/I am, with the setter using the self-referential pronoun)] contained in ( in ) WORTH(value/merit).
Source: Fifteensquared
Answer
WORDSMITH