The most common and most likely answer to this crossword clue is the 2 plus 4 letter word AT LAST
I've seen this crossword clue in The Times
A
T
L
A
S
T
More clues leading to the result AT LAST
- Old supporter of Sky TV kicking off eventually
- Map book landing on top of table finally.
- Maps leading to Turkish capital, finally
- Where cobbler might toil in the end
- Finally book end of August
- Finally book foremost of tours
- Geographer's helper on time, finally
- Jacket's back on book after much delay
- Finally trek leader follows maps in a book
- Reference book gets bought, finally. Finally!
Buddy explains!

The straight part
We know that "after much delay" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case after much delay = at last.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.