Idyllic place in Sudan a xenophobe flipped over (6)
I believe the answer is:
xanadu
'idyllic place' is the definition.
(I've seen this before)
'sudan a xenophobe flipped over' is the wordplay.
'over' indicates a hidden word (the clue contains or goes 'over' the answer).
'flipped' is a reversal indicator.
'udanax' is hidden in the letters of 'sudan a xenophobe'.
'udanax' back-to-front is 'XANADU'.
'in' acts as a link.
(Other definitions for xanadu that I've seen before include "Wonderful place of Coleridge's Kubla Khan" , "Kubla Khan's capital as in Coleridge's poem" , "'In . . . . . . did Kubla Khan / a stately pleasure-dome decree' (Coleridge)" , "ideal place" , "Where Kubla Khan decreed his pleasure-dome be built" .)