The most common and most likely answer to this crossword clue is the 7 letter word STATERS
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More clues leading to the result STATERS
Buddy explains!

The straight part
We know that "Old coins" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old coins = staters.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 STATERS mean?
STATERS noun- A gold, silver or electrum coin of ancient Greece.
- One who states.
- A citizen of the United States of America who is a confirmed or lifelong resident of one single state.