Perfect place in the middle of Luton, one in quiet area (6)
I believe the answer is:
utopia
'perfect place' is the definition.
(I've seen this before)
'middle of luton one in quiet area' is the wordplay.
'middle of' means to look at the middle letters.
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'quiet' becomes 'p' (music symbol for 'piano').
'area' becomes 'a' (maths abbreviation**).
The central letters of 'luton' are 'uto'.
'p'+'a'='pa'
'i' placed inside 'pa' is 'pia'.
'uto'+'pia'='UTOPIA'
'in the' is the link.
(Other definitions for utopia that I've seen before include "place of bliss" , "Sir Thomas More's ideal society" , "Imagined state of perfection" , "Ideal country" , "More's imaginary state" .)