Melody dances across street without pretension (8)
I believe the answer is:
modestly
'without pretension' is the definition.
'melody dances across street' is the wordplay.
'dances' is an anagram indicator.
'across' means one lot of letters goes inside another.
'street' becomes 'st'.
'melody' is an anagram of 'modely'.
'modely' going around 'st' is 'MODESTLY'.
(Other definitions for modestly that I've seen before include "In an unassuming, unpretentious way" , "in low-key fashion" , "In unassuming manner" , "Unassumingly" , "In demure fashion" .)