Articles presented in trifling taste for numskull (7)
I believe the answer is:
fathead
'for numskull' is the definition.
(thesaurus)
'articles presented in trifling taste' is the wordplay.
'articles' becomes 'the a' (two grammatical articles).
'presented in' is an insertion indicator.
'trifling taste' becomes 'fad' (fad is a kind of taste. I am not sure about the 'trifling' bit.).
'thea' put into 'fad' is 'FATHEAD'.
Can you help me to learn more?
(Other definitions for fathead that I've seen before include "Stupid person" , "Fool" , "Slang idiot with enlarged cranium?" , "silly ass!" , "Dimwit" .)