Some of fugitives turned up? Nonsense! (4)
I believe the answer is:
guff
'nonsense' is the definition.
(I've seen this before)
'some of fugitives turned up?' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'turned up?' says the letters should be written backwards.
'ffug' is hidden within 'of fugitives'.
'ffug' back-to-front is 'GUFF'.
(Other definitions for guff that I've seen before include "Slangy nonsense, empty talk" , "Worthless talk/ideas" , "Tripe" , "Rubbish!" , "Worthless ideas or talk" .)