Poems of modesty (4)
I believe the answer is:
odes
'poems' is the definition.
(ode is a kind of poem)
'of modesty' is the wordplay.
'of' indicates a hidden word.
'ODES' is hidden in the letters of 'modesty'.
(Other definitions for odes that I've seen before include "Lines" , "Poems in praise" , "Poets write them" , "Keats was fond of them" , "Songs" .)