Gauche mistake overwhelms scientist (7)

I believe the answer is:

chemist

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

'scientist' is the definition.
(I know that chemist is a type of scientist)

'gauche mistake overwhelms' is the wordplay.
'CHEMIST' is hidden in amongst the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for chemist that I've seen before include "Pharmacist, apothecary" , "Shop for drugs" , "Shop selling medicines" , "Seller of medications" , "Seller of medicines and toiletries" .)

I've seen this clue in The Irish Times.

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