The most common and most likely answer to this crossword clue is the 5 letter word ACTOR
I've seen this crossword clue in The Daily Telegraph
A
C
T
O
R
More clues leading to the result ACTOR
- Influence seeing dismissal of foremost performer
- Player’s agent clearing fine
- 7 works avoiding extremes
- Starts to acquire cheap tops off rugby player
- Player on stage removing agent’s head
- Missing header, circumstance for player
- Rising schedule restricts club player
- Performer making some impact originally
- Portion of carrot cake served up for performer
- Entertainer’s duty list put up around clubs
Buddy explains!

The straight part
We know that "ham" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ham = actor.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 ACTOR mean?
ACTOR noun- A person who performs, plays a part in a theatrical play or film.
- One who acts; a doer.
- One who takes part in a situation.
- An advocate or proctor in civil courts or causes.
- One who institutes a suit; plaintiff or complainant.
- (policy debate) One who enacts a certain policy action.
- The entity that performs a role (in use case analysis).
- (grammar) The most agent-like argument of a clause, e.g. 'the torpedo' in "The torpedo sank the boat" and "The torpedo fired".