How to delete/reset specific field?

[razb-viola]

I have a select box component which allows the user to choose from list of options.
For example: colors can be red, green and blue.
Now I want to enable a clear button so if regrets and decide not to pick a color at all I don't have any ability to do that.
Only what I can to do is: resetField('color', '') which is not clearing the field but assign some string. I want to entirely delete this property from the object - as just as was if the user hasn't selected it at all and leaved it blanked from first of all.

Note: If I define no second parameter in the resetField, it just doesn't work.

How can it be achieved using react hook form?