Pool bar (8,4)

I believe the answer is:

watering hole

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for watering hole that I've seen before include "Pool" , "where to get a drink" , "Employer of barmaid" , "Public house (found in a desert?)" , "bar" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app