The most common and most likely answer to this crossword clue is the 4 plus 2 letter word PAST IT
P
A
S
T
I
T
More clues leading to the result PAST IT
- Decrepit little bird found on step
- Far from fresh aniseed drink: time for a second?
- Point about sparkling wine: not much good now?
- Small bird seen by old man over the hill
- Secretary birds soaring over the hill
- Ancient vessel emptied, filled with fizzy wine
- Decrepit old man’s boob
- No more sex, being thus?
- A heartless sot in bed is over the hill
- Dad’s nipple is redundant
Buddy explains!

The straight part
We know that "Ancient" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ancient = past it.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.