Check if object was enabled

In my game I have a clock. When I press Esc, I open main menu and disable clock (images of the numbers and script, which make clock going). And when I press Esc again, clock became visible, but it don’t going because I launched coroutines in the script (in Start function) and after disable/enable object it didn’t launched again.

So is it any way to check in the script if object was enabled?
But not in Update function (with activeSelf), because I need to check if object enabled and launch coroutine only one time.

My code can’t restart coroutine, after it’s parent object was disabjed:

bool isClockStarted;

void Update()
    if(gameObject.activeSelf &&

        isClockStarted = true;

        isClockStarted = false;

Use OnEnable