Bishop enthralled by Thomas, saint with unique memorial (9)

I believe the answer is:

tombstone

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'memorial' is the definition.
(I know that tombstone is a type of memorial)

'bishop enthralled by thomas saint with unique' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'enthralled by' is an insertion indicator ('enthral' can mean 'capture').
'thomas' becomes 'tom'.
'saint with' becomes 'st' (abbreviation. I am not sure about the 'with' bit.).
'unique' becomes 'one' (synonyms).
'tom'+'st'='tomst'
'b' placed into 'tomst' is 'tombst'.
'tombst'+'one'='TOMBSTONE'

Can you help me to learn more?

(Other definitions for tombstone that I've seen before include "Graveyard marker" , "Does it display departure date" , "Last monument" , "film location" , "Where to find epitaph" .)

I've seen this clue in The Telegraph.

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