Bird in cloud overhead (4)
I believe the answer is:
dove
'bird' is the definition.
(dove is a kind of bird)
'in cloud overhead' is the wordplay.
'in' says the answer is hidden in the clue.
'DOVE' is hidden in the letters of 'cloud overhead'.
(Other definitions for dove that I've seen before include "Peace lover; bird" , "Pigeon-like bird" , "Symbol of peace" , "plunged in the Grand Canyon" , "Peacemaker" .)