Two rivers understood to rhyme (5)
I believe the answer is:
poems
'understood to rhyme' is the definition.
I can't judge whether this defines the answer.
'two rivers' is the wordplay.
'two rivers' means two replacements for 'river'.
'river' becomes 'po' (Italian river).
'river' becomes 'ems' (I've seen this before).
'po'+'ems'='POEMS'
Can you help me to learn more?
(Other definitions for poems that I've seen before include "Compositions, in metrical feet usually" , "Mopes about with verses" .)