Highlight one name in several foreign articles (9)
I believe the answer is:
underline
'highlight' is the definition.
(I know that highlight can be written as underline)
'one name in several foreign articles' is the wordplay.
'one name' becomes 'Erl'.
'in' means one lot of letters goes inside another.
'several foreign articles' becomes 'undine' (I can't explain this - if you can you should give a lot more credence to this answer).
'erl' put within 'undine' is 'UNDERLINE'.
Can you help me to learn more?
(Other definitions for underline that I've seen before include "Form of emphasis in writing" , "Give extra weight to, stress" , "Reinforce" , "To show emphasis in writing" , "Emphasise with horizontal drawing" .)