The rhyme's right, but it's banal (5)
I believe the answer is:
trite
'it's banal' is the definition.
(I've seen this in another clue)
'the rhyme's right' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'rhyme's' indicates a 'sounds like' (homophone) clue (I've seen 'rhyme' mean this).
'right' sounds like 'rite'.
't'+'rite'='TRITE'
'but' acts as a link.
(Other definitions for trite that I've seen before include "Dull, unoriginal" , "used till novelty's worn off" , "Banal, commonplace" , "all vigour is gone" , "Overfamiliar through overuse" .)