Crossword Genius

What would Dr Jekyll do suddenly to change direction on a street in New York? (4,5)

Ross

I believe the answer is:

turn nasty

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'what would dr jekyll do suddenly to change' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'direction on a street in new york?' is the wordplay.
'direction on' becomes 'turn' (I can't explain this - if you can you should believe this answer much more).
'street' becomes 'st'.
'in' means one lot of letters goes inside another.
'new york?' becomes 'ny'.
'a'+'st'='ast'
'ast' put inside 'ny' is 'nasty'.
'turn'+'nasty'='TURN NASTY'

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I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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