Crossword Genius

Extraterrestrial's son's declining wits (6)

Ross

I believe the answer is:

comics

'wits' is the definition.
(wit can mean a comical person)

I cannot understand how the remainder of the clue works.

(Other definitions for comics that I've seen before include "Funny performers" , "Cartoon periodicals" , "funny material" , "Children's periodicals" , "Comedians" .)

I've seen this clue in The Guardian.
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