The most common and most likely answer to this crossword clue is the 4 letter word TELE
T
E
L
E
More clues leading to the result TELE
Buddy explains!

The straight part
We know that "set" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case set = tele.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 TELE mean?
TELE noun- Television.
- A television set.
- A hotel or motel.