Call the given function after a certain period of time has passed.
| Parameters | clock | The object which will be used to schedule the delayed call. (type: IReactorTime provider) |
| delay | The number of seconds to wait before calling the function. (type: float or int) |
| callable | The object to call after the delay. |
| *args | The positional arguments to pass to callable. |
| **kw | The keyword arguments to pass to callable. |
| Returns | A deferred that fires with the result of the callable when the specified time has elapsed. (type: defer.Deferred) |