Wonder that not even Juliet married a prince (3,5)
I believe the answer is:
taj mahal
'wonder' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'that not even juliet married a prince' is the wordplay.
'not even' means one should take alternating letters (remove even-numbered letters).
'juliet' becomes 'J' (phonetic alphabet: alpha, bravo, charlie etc.).
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'prince' becomes 'hal' (Shakespearean nickname of Henry V when a prince).
The alternate letters of 'that' are 'ta'.
'ta'+'j'+'m'+'a'+'hal'='TAJ MAHAL'
Can you help me to learn more?
(Other definitions for taj mahal that I've seen before include "Mausoleum at Agra built in memory of emperor's favourite wife" , "... mausoleum raised by ..." , "Marble mausoleum in India built in memory of a wife" , "Mausoleum at Agra in memory of a Mogul wife" , "Famous Indian mausoleum in Agra" .)