Curse put on British land (6)
I believe the answer is:
blight
'curse' is the definition.
(blight can mean a curse or affliction)
'on british land' is the wordplay.
'on' means one lot of letters go next to another.
'british' becomes 'b' (abbreviation e.g. in BBC).
'land' becomes 'light' (light can mean to settle or land).
'b' put next to 'light' is 'BLIGHT'.
'put' is the link.
(Other definitions for blight that I've seen before include "Disease that withers plants like potatoes" , "Disease of plants etc" , "Plant disease; urban eyesore" , "Disease - pest" , "Affliction" .)