The most common and most likely answer to this crossword clue is the 5 letter word RERUN
I've seen this crossword clue in The Times
R
E
R
U
N
More clues leading to the result RERUN
- Play again on middle of March and middle of June
- About to rush for second viewing
- Admirer unveils boxing programme again
- Repeat programme showing Her Majesty in control
- Second showing somewhat nearer university
- At last, AtmosClear! We offer you clean air again
- Soldiers collapse after blocking one later appearance
- Last parts of earlier game later you can show again
- . . . . A- in bum French article shown again
- Getting into period drama on TV
Buddy explains!

The straight part
We know that "Second showing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case second showing = rerun.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 RERUN mean?
RERUN noun- A television program shown after its initial presentation — particularly many weeks after its initial presentation; a repeat.
- Another printing run (impression; batch of copies of a given edition) of a book, cartoon, etc.
- A political candidate who holds the same political agenda or doctrine as a past or incumbent holder of a given political office.
- A second or subsequent run of a program.
- To run (a previously broadcast television program) again.
- To run (a race) again.
- To run (a computer program) again.