Cryptic crossword clue
Undertake surprise audit to identify arrangement of men on board 4-5

The most common and most likely answer to this crossword clue is the 10 letter word SPOT-CHECK

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Undertake surprise audit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case undertake surprise audit = spot-check.
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 SPOT-CHECK mean?

SPOT-CHECK noun
  1. A cursory inspection or examination or the inspection or examination of a sample of something.
SPOT-CHECK verb
  1. To inspect or examine briefly, or by sampling.

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