Seal sets in box with must-haves (10)

I believe the answer is:

essentials

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'must-haves' is the definition.
I can't judge whether this definition defines the answer.

'seal sets in box' is the wordplay.
'box' is an anagram indicator (the letters are knocked about).
'seal'+'sets'+'in'='sealsetsin'
'sealsetsin' anagrammed gives 'ESSENTIALS'.

'with' is the link.

Can you help me to learn more?

(Other definitions for essentials that I've seen before include "necessities" , "Things needed" .)

I've seen this clue in The Irish Times.

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