Juliet married a prince after retreating at a mausoleum (3,5)
I believe the answer is:
taj mahal
'a mausoleum' is the definition.
(I've seen this before)
'juliet married a prince' is the wordplay.
'juliet' becomes 'taj' (I can't explain this - if you can you should believe this answer much more).
'married' becomes 'm'.
'prince' becomes 'hal' (I've seen this before).
'taj'+'m'+'a'+'hal'='TAJ MAHAL'
'after retreating at' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for taj mahal that I've seen before include "Famous mausoleum in Agra in northern India" , "Marble mausoleum in India built in memory of a wife" , "... mausoleum raised by ..." , "Agra memorial" , "Agra tourist attraction" .)