Shows lad is spy (8)

I believe the answer is:

displays

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

'shows' is the definition.
(I know this)

'lad is spy' is the wordplay.
'lad is spy' can be anagrammed to 'DISPLAYS'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for displays that I've seen before include "Arranges for inspection, shows" , "Sid plays badly and exhibits" .)

I've seen this clue in The Irish News.

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