Was secretive about some outlandish ideas (3)

I believe the answer is:

hid

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

'was secretive' is the definition.
I can't tell whether this defines the answer.

'about some outlandish ideas' is the wordplay.
'about' says the answer is hidden in the clue.
'HID' can be found hidden inside 'some outlandish ideas'.

Can you help me to learn more?

(Other definitions for hid that I've seen before include "Concealed, kept secret" , "Remained out of sight" , "Concealed from sight" , "Kept out of sight" , "wanted to be sought?" .)

I've seen this clue in the Evening Standard.

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