High part of a memorial obelisk (3)
I believe the answer is:
Here is my best explanation:
'high part' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'of a memorial obelisk' is the wordplay.
'of' says the answer is hidden in the clue.
'LOB' can be found hidden inside 'memorial obelisk'.
Can you help me to learn more?