The most common and most likely answer to this crossword clue is the 6 letter word REAGAN
R
E
A
G
A
N
More clues leading to the result REAGAN
- Shakespearean character inspiring a film actor later taking bigger role
- President rejects a calculating daughter
- Uncontrolled anger about a former US president
- On with old commander, new president
- Dramatic princess entertaining American president
- Former president of America consumed by misguided anger
- President from Georgia featured in article supporting soldiers
- Ronald referring to silver article
- Western star on a horse falling over
- Unuusual anger about a former US president
Buddy explains!

The straight part
We know that "Old actor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old actor = reagan.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.