Nauseating article turns up in English clubs (6)
I believe the answer is:
emetic
'nauseating' is the definition.
(I've seen this before)
'article turns up in english clubs' is the wordplay.
'article' becomes 'item' (I've seen this before).
'turns up' says the letters should be written backwards.
'in' is an insertion indicator.
'english' becomes 'E' (abbreviation).
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'item' reversed gives 'meti'.
'e'+'c'='ec'
'meti' inserted within 'ec' is 'EMETIC'.
(Other definitions for emetic that I've seen before include "Medicine designed to make one vomit" , "inducing sickness" , "Medicine taken to make one vomit" , "Sickening" , "Ipecac is one" .)