What Sadie could give a chap? (5)

I believe the answer is:

ideas

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

'could give a chap?' is the definition.
I can't judge whether this definition defines the answer.

'what sadie' is the wordplay.
'sadie' anagrams to 'IDEAS'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for ideas that I've seen before include "Brain waves" , "Notions, thoughts" , "Thoughts or opinions" , "Fancies" , "Thoughts, perceptions" .)

I've seen this clue in the Evening Standard.

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