Harsh Dickensian Dr — niggard, sadly (9)
I believe the answer is:
gradgrind
'harsh dickensian' is the definition.
(strict teacher in Dickens' Hard Times)
'dr niggard sadly' is the wordplay.
'sadly' is an anagram indicator.
'dr'+'niggard'='drniggard'
'drniggard' is an anagram of 'GRADGRIND'.
(Other definitions for gradgrind that I've seen before include "'Facts' fanatic (Hard Times)" , "Merchant in Hard Times (Dickens)" , "Dickens's 'facts' schoolteacher" .)