Names building in Capital (5)
I believe the answer is:
means
'capital' is the definition.
(I've seen this before)
'names building' is the wordplay.
'building' indicates an anagram.
'names' with letters rearranged gives 'MEANS'.
'in' is the link.
(Other definitions for means that I've seen before include "Ways" , "Designs" , "plans" , "unpopular test" , "Intends; income" .)