Unsteady, twisted across wide street (6)
I believe the answer is:
'unsteady' is the definition.
(I've seen this in another clue)
'twisted across wide street' is the wordplay.
'twisted' becomes 'wry' (I've seen this in another clue).
'across' means one lot of letters goes inside another.
'wide street' becomes 'ave' (short for avenue).
'wry' placed around 'ave' is 'WAVERY'.
(Another definition for wavery that I've seen is " Irresolute; unsteady".)