Goes here and there following mischievous type to rallies (8)
I believe the answer is:
improves
'to rallies' is the definition.
(I've seen this before)
'goes here and there following mischievous type' is the wordplay.
'goes here and there' becomes 'roves' (as in roving around).
'following' means one lot of letters go next to another.
'mischievous type' becomes 'imp' (I've seen this in another clue).
'roves' put after 'imp' is 'IMPROVES'.
(Other definitions for improves that I've seen before include "Rallies" , "Makes progress" , "Becomes better" , "Gets better" .)