Ts 250 Clutch Problem

ive just recently starting having problems with my clutch...my bike is a 1972 Ts 250, i was pushing it down the street on the way to my local riding spot and as i was walking down the street i pulled in my clutch and it got stuck...like i pulled it in and it jammed ...so i walked home and took the side panel off my bike where the clutch is and and pulled the lever in and out a few times and it worked...so i screwed it back on and it worked....and the clutch cable is verry tight...so i thought that must be normal...so i pushed it to my local spot and rode it for a bout 20 mins no problems and then when i stoped for a rest...the clutch wouldnt work.....now u have to pull it in and then push the lever like 500 times before it works again and its pissin me of...i have no money and im saving up for a manual which i wont get till afer christmas....so any help will be accepted...