One form of ancient hut not in tune with Sartre's philosophy? (11)
I believe the answer is:
inauthentic
'not in tune with sartre's philosophy?' is the definition.
(reference to the philosophy of Jean-Paul Sartre)
'one form of ancient hut' is the wordplay.
'one' becomes 'i' (Roman numeral).
'form of' indicates anagramming the letters (the letters need to be in another 'form').
'ancient'+'hut'='ancienthut'
'ancienthut' with letters rearranged gives 'nauthentic'.
'i'+'nauthentic'='INAUTHENTIC'
(Other definitions for inauthentic that I've seen before include "Not genuine" , "Artificial" .)