How do I get the watch?

Hmm, why worry about a silly watch, you could be playing croquet.

No I really mean it.  Play some croquet.  You will uncover
a previously unseen place to go.

If you have dug any holes here, you should fill it in first.

The question should have been, how do I get past the squirrel.

What have you seen that might distract the squirrel?

The nuts.  You need to get rid of that Corn Crake.

Be careful, the squirrel is very devious.

The first thing I tried is to give the nuts to the squirrel

This did not help.  But was a little humorous.

After a while, something else did come to mind.

The verb is throw.

The noun is hole.

Throw the nuts in the hole.  The squirrel will follow.

Now that you have found your way to the back of the house, you
still need some help.

Those birds flying overhead might do the trick.