Some turnip sewed improperly (5)
I believe the answer is:
swede
'some turnip' is the definition.
(swede is a kind of turnip)
'sewed improperly' is the wordplay.
'improperly' indicates anagramming the letters (I've seen this in other clues).
'sewed' anagrammed gives 'SWEDE'.
(Other definitions for swede that I've seen before include "Native of Stockholm" , "Scandinavian; root veg." , "Foreigner" , "Weeds out to get turnip" , "Scandinavian - vegetable" .)