Matriarch lady moving somewhere in London (9,4)
I believe the answer is:
admiralty arch
'somewhere in london' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'matriarch lady moving' is the wordplay.
'moving' indicates an anagram (letters are moved around).
'matriarch'+'lady'='matriarchlady'
'matriarchlady' with letters rearranged gives 'ADMIRALTY ARCH'.
Can you help me to learn more?
(Other definitions for admiralty arch that I've seen before include "Building between The Mall and Trafalgar Square" , "building in London" , "Feature over The Mall" , "Entrance to The Mall off Trafalgar Square" , "London landmark between The Mall and Trafalgar Square" .)