Pick up the little blighter that has toppled over (7)
I believe the answer is:
improve
'pick up' is the definition.
(I've seen this before)
'little blighter that has toppled over' is the wordplay.
'little blighter' becomes 'imp'.
'that has' says to put letters next to each other.
'toppled' indicates anagramming the letters (the order of letters topples or collapses).
'over' with letters rearranged gives 'rove'.
'imp'+'rove'='IMPROVE'
'the' is the link.
(Other definitions for improve that I've seen before include "reform" , "Polish" , "Train" , "Get or make better" , "Make progress" .)