Keying in security PIN grants entry (6)

I believe the answer is:

typing

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'keying' is the definition.
The answer and definition can be both related to thinking as well as being present participle verbs.
Maybe they are linked in a way I don't understand?

'in security pin grants entry' is the wordplay.
'in' indicates a hidden word.
'TYPING' is hidden in the letters of 'security pin grants entry'.

Can you help me to learn more?

(Other definitions for typing that I've seen before include "Using one form of keyboard" , "Keyboarding" .)

I've seen this clue in the Sydney Morning Herald.

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