Renault Clio Mk3 06 clutch pedal not returning

I was in traffic and put my clutch in to change gear and it just stayed on the floor and didn't return a little smoke came from the car and a braking fault signal came up on the dash, the previous day I heard squeaking from the breaks too? Maybe there's something?

I've been told the clutch is fine by a experienced mechanic

The list we think it could be is

? master cylinder

? slave cylinder

? clutch return spring

I'm not sure though I'm a amateur I'm trying to learn....



Thank you in advance