The most common and most likely answer to this crossword clue is the 7 letter word FOREARM
I've seen this crossword clue in The Sunday Telegraph
F
O
R
E
A
R
M
More clues leading to the result FOREARM
- Get ready to show part of body
- Attention required in class — might one be leaning on desk?
- What’s raised to get attention in class?
- Give prior knowledge of mineral found in agricultural land
- Part of body needing listener to be in shape
- Body part receiving attention in class
- Part of body ready for fight
- On which the cubit was measured
- Part of body, organ in shape
Buddy explains!

The straight part
We know that "Part of body" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of body = forearm.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 FOREARM mean?
FOREARM noun- The part of the arm between the wrist and the elbow.
- A section of the weapon between the receiver and the muzzle, used to hold the firearm steady.
- (sometimes figurative) To arm in preparation.