A piece of over-sentimental poetry (5)

I believe the answer is:

verse

'poetry' is the definition.
(I know that poetry can be written as verse)

'a piece of over-sentimental' is the wordplay.
'a piece of' says the answer is hidden in the clue.
'VERSE' can be found hidden inside 'over sentimental'.

(Other definitions for verse that I've seen before include "Poetry, a poem" , "Literature in metrical form" , "Part of a song or poem" , "Part of hymn" , "Poems" .)

I've seen this clue in The Globe and Mail.

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