A single click when you try to start the vehicle usually indicates a corroded/loose battery cable or a faulty starter solenoid/relay switch.
The alternator might be the problem.
It could be a dead battery.
Battery is dead.
my Nissan elgrand just cut out when I was driving it now it wont start can you help me
A good possibility would be a dead battery.
You need a new battery!
It sounds like a dead battery
A no start condition where the starter just clicks.
Could be the Starter or the Transmission
you need a new battery more than likely
It's probably your starter or maybe the sellonoid. Easy to check which it is.
It sounds like you may have a dead battery. Have you tried getting a jump?