Experienced laughter on 1A's introduction (3)
I believe the answer is:
had
'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" .)