The most common and most likely answer to this crossword clue is the 6 letter word ONWARD
I've seen this crossword clue in The Daily Telegraph
O
N
W
A
R
D
More clues leading to the result ONWARD
- Among patients ahead
- Nothing pulled in reverse is going ahead
- Pull number back getting ahead
- Where nurses may be found, ahead
- Advanced hospital staff can be found here
- Ahead, where consultant may be, doing the rounds
- Ring pulled back and forth
- No going back with fighting dead ahead
- Many a nurse will be advancing
- Place of duty for a nurse going to the front
Buddy explains!

The straight part
We know that "Ahead" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ahead = onward.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 ONWARD mean?
ONWARD verb- To keep going; to progress or persevere.
- Moving forward.
- Advanced in a forward direction or toward an end.
- In a forward direction.