Some para inevitably drops from sky (4)
I believe the answer is:
rain
'drops from sky' is the definition.
(drops of water from the sky)
'some para inevitably' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'RAIN' can be found hidden inside 'para inevitably'.
(Other definitions for rain that I've seen before include "Fall in large quantities" , "downfall?" , "Falling moisture" , "See 12" , "eg A shower" .)