Tenor for example in a sewer (6)
I believe the answer is:
singer
I believe this clue is a double definition.
'tenor for example' is the first definition.
(I know that tenor is a type of singer)
'a sewer' is the second definition.
(thesaurus)
'in' acts as a link.
(Other definitions for singer that I've seen before include "One performing song" , "Make of sewing machine" , "Crooner" , "E.g. bass" , "choirboy?" .)