Parental couple taken round an international waterway (6)
I believe the answer is:
panama
'international waterway' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'parental couple taken round an' is the wordplay.
'parental couple' becomes 'pama' (I can't justify this - if you can you should believe this answer much more).
'taken round' is an insertion indicator.
'pama' placed around 'an' is 'PANAMA'.
Can you help me to learn more?
(Other definitions for panama that I've seen before include "Great American canal or tropical hat" , "American canal or kind of hat" , "Hat woven from jipijapa leaves" , "Hat made of plaited palm leaves" , "Great canal connecting Atlantic and Pacific" .)