Woman sent up was unwell (5)
I believe the answer is:
delia
'woman' is the definition.
'sent up was unwell' is the wordplay.
'sent up' says the letters should be written backwards.
'was unwell' becomes 'ailed' (I've seen this in another clue).
'ailed' written backwards gives 'DELIA'.
(Other definitions for delia that I've seen before include "Girl" , "-- Smith, cookery writer" , "-- Smith, TV chef" , "-- Smith, TV cook" , "Sonnets to - (Daniel)" .)