Princess carried inside in other words (6)
I believe the answer is:
isolde
'princess' is the definition.
(legendary princess)
'carried inside in other words' is the wordplay.
'carried' becomes 'sold' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'inside' means one lot of letters goes inside another.
'in other words' becomes 'ie' (abbreviation for 'id est', 'that is' in Latin).
'sold' inserted inside 'ie' is 'ISOLDE'.
Can you help me to learn more?
(Other definitions for isolde that I've seen before include "Lover of Tristan" , "Tristan and ... (Wagner opera)" , "heroine (sic)" , "love potion drinker" , "Soiled like Tristram's love" .)