Lover gives a capital ring (5)
I believe the answer is:
romeo
'lover' is the definition.
(I've seen this before)
'a capital ring' is the wordplay.
'a capital' becomes 'rome' (capital of Italy).
'ring' becomes 'O' (letter resembling a ring).
'rome'+'o'='ROMEO'
'gives' acts as a link.
(Other definitions for romeo that I've seen before include "A loving character" , "Dashing lover" , "Shakespearean character" , "Star-crossed lover" , "Juliet's lover of Verona" .)