I'm not fully sure what the meaning of certo is in this sentence. Does it mean 'a man that is sure of himself watches' or 'a specific man watches'?
"Certo" is one of those adjectives that change meaning with position; "un uomo certo" could be a man that is sure of himself, but "un certo uomo" is "some man" you don't know or don't want to mention.
ayyyyyy .... heartbroken .... because I answered "a sure man watches". Why is that wrong?