Composed lyrical melody? Not all of it (4)
I believe the answer is:
calm
'composed' is the definition.
(similar in meaning)
'lyrical melody? not all of it' is the wordplay.
'not all of it' says the answer is hidden in the clue (only some of the letters are needed).
'CALM' can be found hidden inside 'lyrical melody'.
(Other definitions for calm that I've seen before include "Serene" , "Peace, tranquillity" , "Cool and collected" , "Absence of wind" , "'Tranquil, placid (4)'" .)