Philosopher’s a schemer, son exposes (7)

I believe the answer is:

emerson

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

'philosopher's' is the definition.
(I've seen this before)

'a schemer son exposes' is the wordplay.
'EMERSON' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for emerson that I've seen before include "--, Lake and Palmer, rock group" , "Ralph Waldo . . ., 19th century American philosopher and poet" , "Individualist" , "Ralph Waldo --, US poet" , "Ralph Waldo ......., 19th century American transcendentalist" .)

I've seen this clue in The Hindu.

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