Crossword Genius

Hoping to acquire secret number (3)

Ross

I believe the answer is:

pin

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

'number' is the definition.
(I know that PIN is a type of number)

'hoping to acquire secret' is the wordplay.
'PIN' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for pin that I've seen before include "Skittle; fix" , "Fastener; brooch" , "Fixing device" , "Sewer's aid" , "Badge" .)

I've seen this clue in The Mirror.
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