The most common and most likely answer to this crossword clue is the 3 letter word HAM
I've seen this crossword clue in The Daily Telegraph
H
A
M
More clues leading to the result HAM
- Ineptly act a son of Noah
- Awkward when first on diet of meat sandwiches?
- Inept writing possessed by the writer — had to restrict that
- Pretend son’s out, getting meat
- Henry in the morning delivers meat
- Meat in picnic basket half wasted
- Poor person acting as king let off
- Radio operator‘s ignominy being undressed
- Cure for bad acting?
- An hour in the morning for breakfast?
Buddy explains!

The straight part
We know that "Radio operator" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case radio operator = ham.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 HAM mean?
HAM noun- The region back of the knee joint; the popliteal space; the hock.
- A thigh and buttock of an animal slaughtered for meat.
- Meat from the thigh of a hog cured for food.
- The back of the thigh.
- Electronic mail that is wanted; mail that is not spam or junk mail.
- A dwelling.
- One’s native land; the place or country in which one dwells; the place where one’s ancestors dwell or dwelt.
- The locality where a thing is usually found, or was first found, or where it is naturally abundant; habitat; seat.
- A focus point.
- A directory that contains a user's files.
- An overacting or amateurish performer; an actor with an especially showy or exaggerated style.
- An amateur radio operator.
- To overact; to act with exaggerated emotions.