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Unfortunately, cheapest housing no good: significant progress required (4,6)

Ross

I believe the answer is:

step change

'significant progress required' is the definition.
(a step change is a sudden change in approach)

'unfortunately cheapest housing no good' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'housing' is an insertion indicator.
'no good' becomes 'ng' (abbreviation).
'cheapest' anagrammed gives 'stepchae'.
'stepchae' enclosing 'ng' is 'STEP CHANGE'.

I've seen this clue in The Guardian.
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