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 tell whether this defines the answer.

'what sadie' is the wordplay.
'sadie' anagrams to 'IDEAS'.
But, I'm not clear how the anagram 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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