New Post: Obtain Featureset from map.featurelayer

Hi,
I'm new developer.
one question
I have two polygon featurelayer in map and I want create another using ClipPolygonWithPolygon.
in the documentations and example read this use featureset.
I can use featurelayer ???
if not how can I get the featureset from featurelayer ???
thanks and sorry for my english

Alberto