敵 is built from the 啇 (stem / root (in 適·敵)) and 夂 (going / winter (top)) components.
It belongs to a phonetic family with 摘, 適, and 滴 — they share the 啇 component and the reading テキ.
A common word using 敵 is 敵 (てき), meaning “enemy, rival”.
Don't confuse it with 摘, 適, 滴, and 嫡.