Lout in raid about to steal ring (4)
I believe the answer is:
boor
'lout' is the definition.
(I've seen this before)
'raid about to steal ring' is the wordplay.
'raid' becomes 'rob'.
'about' says the letters should be written in reverse.
'to steal' is an insertion indicator.
'ring' becomes 'o' (letter resembling a ring).
'rob' back-to-front is 'bor'.
'bor' placed around 'o' is 'BOOR'.
'in' is the link.
(Other definitions for boor that I've seen before include "Rude, uncultivated person" , "Rough, bad-mannered person" , "Coarse, ill-mannered person" , "Lout" , "Barbarian" .)