Storage facility - kid's play? (4)

I believe the answer is:

disk

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

'storage' is the definition.
(I know that disk is a type of storage)

'facility kid's play?' is the wordplay.
'kid's' anagrams to 'DISK'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for disk that I've seen before include "Thin, flat, circular plate" , "Floppy - - (comput.)" .)

I've seen this clue in The Irish Times.

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