Customer certificate overwhelms textile dealer (6)

I believe the answer is:

mercer

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

'textile dealer' is the definition.
(I've seen this before)

'customer certificate overwhelms' is the wordplay.
'MERCER' is hidden within the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for mercer that I've seen before include "Old tradesman" , "Dealer in fine cloth" , "Textile dealer (historical)" , "Supplier of fabrics" , "Dealer in textile fabrics" .)

I've seen this clue in The Hindu.

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