A river crossed by vessel: this one? (9)
I believe the answer is:
catamaran
'this one?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'a river crossed by vessel' is the wordplay.
'river' becomes 'tamar' (I've seen this before).
'crossed by' indicates putting letters inside (inserted letters are crossed or covered by others).
'vessel' becomes 'can' (type of container).
'a'+'tamar'='atamar'
'atamar' put within 'can' is 'CATAMARAN'.
Can you help me to learn more?
(Other definitions for catamaran that I've seen before include "Two-hulled boat" , "Twin-hulled craft" , "Twin-hulled sailing boat" , "Vessel with twin hulls" , "Quarrelsome woman" .)