A compound word for a flow of air directly behind a boat or plane that increases its speed. Keep in mind: The first word may be at the bottom.
Reveal top + bottom answer and reasoning
Answer: TAIL WIND
Top half: TAIL - TAIL is the first half of "tail wind", the top + bottom answer for the shared final clue: "A compound word for a flow of air directly behind a boat or plane that increases its speed. Keep in mind: The first word may be at the bottom".
Bottom half: WIND - WIND completes "tail wind", so the top and bottom rows answer the shared final clue together.