Insert text after search via Button into a text field

I have an input field in which the user can edit text and copy'n-paste. The text field is in the middle of the screen. On the right side I have a search area. If the user found something he can insert some text of the result into the text field (in the middle).

The insert should be some kind of replace in the text field where the user has placed his cursor.

The problem: While editing the cursor blinks and the user knows where the text will be inserted. But after the search the focus is transferred from the text field to the search area. The browser stops blinking in the text field and the user has after some interaction with the search area no visual clue where the text will be inserted.

Anybody has an idea how to support the user with some kind of visual clue? Or is there a (good) sample?