The most common and most likely answer to this crossword clue is the 4 plus 2 letter word URGE ON
U
R
G
E
O
N
More clues leading to the result URGE ON
- Encourage operator to doff cap
- Encourage holy man to leave fish
- Encourage theatre worker who’s lost his head
- Incite doctor to blow top
- Incite masked man in theatre, losing head
- Encourage operator to release latest of numbers
- Encourage someone in operating theatre first off
- Press cutting one in theatre’s not initially seen
- Doctor losing his head? Encourage
- Surgeons exhibiting drive
Buddy explains!

The straight part
We know that "urgeon/drive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case urgeon/drive = urge on.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.