Crossword Genius

Experienced laughter on 1A's introduction (3)

Ross

I believe the answer is:

had

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'experienced' is the definition.
(having is a kind of experiencing)

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

Can you help me to learn more?

(Other definitions for had that I've seen before include "Owned in the past" , "Did trick" , "Was bound to be - caught" , "Was in possession of" , "kept" .)

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