The most common and most likely answer to this crossword clue is the 6 letter word EFFORT
I've seen this crossword clue in The Times
E
F
F
O
R
T
More clues leading to the result EFFORT
- You will need some beef for this!
- 4 Endeavour to put very loud men in sci-fi film
- Anything made in France beneficial to stopping European market’s closure
- Try slice of beef for tea
- Try to perform forfeit without involving me
- Attempt to elevate iron building
- Attempt from left to shell stronghold
- Try new offer and wait, ultimately
- Only a little relief for terrorist, shot
- Hard work requiring energy and force in proportion to time
Buddy explains!

The straight part
We know that "Endeavour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case endeavour = effort.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 EFFORT mean?
EFFORT noun- The work involved in performing an activity; exertion.
- An endeavour.
- A force acting on a body in the direction of its motion.
- To make an effort.
- To strengthen, fortify or stimulate