The most common and most likely answer to this crossword clue is the 2 plus 4 letter word AT HAND
I've seen this crossword clue in The Times
A
T
H
A
N
D
More clues leading to the result AT HAND
- Close contract finally, with some help around
- Approaching a worker about task, putting out request
- By being executed, prophet died
- Hadn’t a doctor nearby
- Conveniently near English city and Bishop goes AWOL
- Bill’s welcoming conjunction that’s about to happen
- Present in the vicinity
- Within easy reach of a labourer saving time
Buddy explains!

The straight part
We know that "Approaching" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case approaching = at hand.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.