The most common and most likely answer to this crossword clue is the 8 letter word SUBTRACT
S
U
B
T
R
A
C
T
More clues leading to the result SUBTRACT
- Take away inferior piece of land?
- Flyer follows boat to take off
- Take off in boat over region
- Take away vehicles come back round time and time again
- Withhold advance payment associated with land area
- Withdraw pamphlet after advance payment
- Dock in area of land next to reserve
- Take off from PSV going over country
- Overturned U-boat reportedly hunted in dock
- Take away warship on land
Buddy explains!

The straight part
We know that "Take off" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case take off = subtract.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SUBTRACT mean?
SUBTRACT verb- To remove or reduce; especially to reduce a quantity or number