Crossword Genius

Box set in disarray following investigation? Not right! (3,5)

Ross

I believe the answer is:

sea chest

I'm a little stuck... Click here to teach me more about this clue!

'box' is the definition.
(I know that sea chest is a type of chest)

'set in disarray following investigation? not right' is the wordplay.
I cannot quite see how this works, but
an anagram of 'set' is 'est' which is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for sea chest that I've seen is " What sailor may have".)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app