The rest going after boy creating troubles (6)
I believe the answer is:
blight
'troubles' is the definition.
(thesaurus)
'the rest going after boy' is the wordplay.
'the rest' becomes 'light' (light can mean to land or rest on the ground).
'going after' means one lot of letters go next to another.
'boy' becomes 'b' (abbreviation used in schools).
'light' after 'b' is 'BLIGHT'.
'creating' acts as a link.
(Other definitions for blight that I've seen before include "Pestilence or disease, as of potatoes" , "Disease - pest" , "Disease or fungus that withers plants, say potatoes" , "Problem of plants or urban development" , "Plant disease or malign influence" .)