The most common and most likely answer to this crossword clue is the 6 letter word REPLAY
I've seen this crossword clue in The Daily Telegraph
R
E
P
L
A
Y
More clues leading to the result REPLAY
- Answer includes a repeat fixture
- Repeat overture to Patience during broadcast
- Another chance to watch priest taking part in race
- Agent, amateur, at match after draw
- Broadcast featuring opening of peep show again
- Answer involving a repeat fixture
- Encore of Queen record with Plant
- Beginning to perform in broadcast encore
- Again show power in a kind of race
- Repeat performance by upcoming amateur
Buddy explains!

The straight part
We know that "Encore" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case encore = replay.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 REPLAY mean?
REPLAY noun- The replaying of (something), for example of televised footage.
- Saved video footage of the gameplay of a computer game
- A replayed match, often after the first game or match ended in a draw.
- To play again.
- To display a recording of a previous event, especially multiple times.