Cryptic crossword clue
Umpire: ‘It’s very simple after opener’s dismissed to get set again‘ 8

The most common and most likely answer to this crossword clue is the 8 letter word REFREEZE

I've seen this crossword clue in The Guardian
R
E
F
R
E
E
Z
E

Buddy explains!

The straight part
We know that "get set again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get set again = refreeze.
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 REFREEZE mean?

REFREEZE verb
  1. To freeze again.
  2. To freeze again.

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