Daily tram serving old Whitehall building (9)
I believe the answer is:
admiralty
'old whitehall building' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'daily tram' is the wordplay.
'daily tram' can be anagrammed to 'ADMIRALTY'.
Though, I am not sure how the anagram is indicated.
'serving' is the link.
Can you help me to learn more?
(Other definitions for admiralty that I've seen before include "UK state department in charge of the Royal Navy" , "HQ" , "Former Department in charge of the navy in Britain" , "Department of 1 across in charge of the Navy" .)