Crossword Genius

Silly leading characters in Dad's Army and Fawlty Towers (4)

Ross

I believe the answer is:

daft

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'silly' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for daft that I've seen before include "Idiotic" , "'Silly, foolish (4)'" , "'---- as a brush': dotty" , "Informally crazy as a brush" , "Bats!" .)

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