Help in making a pond

I've got my OH to start digging a hole to make a start on our wildlife pond for next year. Once it was ready I was going to put pond liner in. However , my soil is heavy clay so now it has filled up with rainwater without intervention , I think we have created a sump.
What are my next steps from here? If I took the water out and then put pond liner in would that be ok? Or would water from surrounding areas simply drain back into the hole and gather under the liner , thus complicating things further ?
What are my next steps from here? If I took the water out and then put pond liner in would that be ok? Or would water from surrounding areas simply drain back into the hole and gather under the liner , thus complicating things further ?
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