What Isaac Newton Was Under When Hit on the Head

This page is the CodyCross answer for the clue below from Earth, Group 1, Puzzle 2.

Question is: What Isaac Newton Was Under When Hit on the Head

and the answer is: APPLETREE

Word Meaning:

APPLE TREE — (botany) Any tree that bears apples, principally Malus domestica but also certain wild species.

Definitions from Wiktionary.

What Isaac Newton was under when hit on the head — CodyCross Answer | CodyCross Solutions