The most common and most likely answer to this crossword clue is the 5 plus 2 letter word THROW IN
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "Move to continue playing football/concede defeat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case move to continue playing football/concede defeat = throw in.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 THROW IN mean?
THROW IN noun- A set-piece where the ball is thrown back into play
- A throw of the ball back into play by the boundary umpire. The umpire faces away from the players and throws it in over his or her shoulder (so as to clearly not favour either side by where exactly it's thrown).
- The start time of a Gaelic football match, comparable to kick off in other games.
- An extra item added free of charge; a product that is thrown in with another.