I wouldn't say it's enough if you're running major compounds like test. Mildly suppressive compounds like Anavar or something, yeah it might work if you do Nolva-only. But overall I think it depends what you're running with it.

If you don't want to go with Clomid, just do Aromasin with your Nolva (Nolva + Aromasin combo apparently works amazing synergistically). This is what I will be using for my upcoming cycle's PCT.