Ingredient section of clientele mentioned (7)

I believe the answer is:

element

'ingredient' is the definition.
('element' can be a synonym of 'ingredient')

'section of clientele mentioned' is the wordplay.
'section of' indicates a hidden word.
'ELEMENT' is hidden within 'clientele mentioned'.

(Other definitions for element that I've seen before include "Essential factor" , "Chemical building-block" , "A first principle, found in a kettle?" , "Fundamental component" , "Eg copper" .)

I've seen this clue in The Telegraph.

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