It's definitely something you want sorted sooner than later. The clutch went on my Impreza about a month before I got it turboed, pulled onto Abernethy rd and all of a sudden it was revs spiking but no speed. Had to limp home from the airport up the hill with only a touch of usable accelerator before it started slipping - not a fun experience!

Had my clutch cable adjusted and it allowed the clutch to engage properly again, was only a temporary fix as it was all getting ripped out in a months time anyway - survived with no slip until the night before it was due to go in with a few accidental clutch burning moments in between so it worked at least!

I've been quoted recently around the $1200 supplied and fitted mark for an uprated clutch + install