Immodestly hiding lyrics (4)
I believe the answer is:
odes
'lyrics' is the definition.
(I know this)
'immodestly hiding' is the wordplay.
'hiding' says the answer is hidden in the clue.
'ODES' can be found hidden inside 'immodestly'.
(Other definitions for odes that I've seen before include "Songs" , "poetry" , "To a Skylark, To a Nightingale etc" , "Lays" , "verse" .)