Nervous picadors scattered (8)
I believe the answer is:
sporadic
'scattered' is the definition.
('sporadic' can be similar in meaning to 'scattered')
'nervous picadors' is the wordplay.
'nervous' is an anagram indicator (shaking).
'picadors' with letters rearranged gives 'SPORADIC'.
(Other definitions for sporadic that I've seen before include "Occurring now and then - cop raids (anag)" , "Fitful, intermittent" , "Occurring here and there, like picadors" , "Random" , "Happening irregularly" .)