Tear Sue away? Harsh (7)
I believe the answer is:
austere
'harsh' is the definition.
(I've seen this before)
'tear sue away?' is the wordplay.
'away?' indicates anagramming the letters (letters move away from their original places).
'tear'+'sue'='tearsue'
'tearsue' with letters rearranged gives 'AUSTERE'.
(Other definitions for austere that I've seen before include "Severe in manner" , "Severe in appearance" , "Stern, grave" , "Plain, cold" , "'Spartan, simple (7)'" .)