Low detective taken down a peg (7)

I believe the answer is:

humbled

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

'taken down a peg' is the definition.
I can't tell whether this definition defines the answer.

'low detective' is the wordplay.
'low' becomes 'humble' (similar in meaning).
'detective' becomes 'd' (this might be a standard abbreviation I've not previously seen).
'humble'+'d'='HUMBLED'

Can you help me to learn more?

(Other definitions for humbled that I've seen before include "Crushed" , "Brought low" .)

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

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