In general, sedimentary material with nasty smell and coarse (11)
I believe the answer is:
marlborough
'in general' is the definition.
'marlborough' can be an answer for 'general' (Duke of Marlborough). I am not certain of the 'in' bit.
'sedimentary material with nasty smell and coarse' is the wordplay.
'sedimentary material' becomes 'marl' (marl is a kind of material. I am not sure about the 'sedimentary' bit.**).
'with' is a charade indicator (letters next to each other).
'nasty smell' becomes 'bo' (body odour).
'and' means one lot of letters go next to another.
'coarse' becomes 'rough' ('rough' can be similar in meaning to 'coarse').
'marl'+'bo'+'rough'='MARLBOROUGH'
(Other definitions for marlborough that I've seen before include "Blenheim duke; town" , "- St, orange property (Monopoly)" , "Blenheim victor" , "22 [WILTS] College" , "public school" .)