Access symbol inside movie clip

Hi all.

I’m sure this has been asked but the search is not working atm. Basically I have an movie clips which contains various other movie clips. These other clips are named clip1_mc etc.

This big movie clip is dropped onto a frame in the main timeline so it plays when the program loads. I have my main actions on the timeline and I want to access the movie clip instance names inside the big clip. Is there a call to maybe get the children or contents of a clips using an event listener?

Many Thanks