Asian dietary staple: jam sandwiches to start with (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

This took a while, with ‘sandwiches’ being a regular containment indicator, until I thought of looking up other definitions of ‘noodle’ and found ‘to improvise on a musical instrument in a casual or desultory way, especially in jazz’ – or ‘to jam’, so it’s simply NOODLE (jam) + S[andwiches]