Experimentally launch a bird of prey? (3,1,4)
I believe the answer is:
fly a kite
'experimentally' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'launch a bird of prey?' is the wordplay.
'launch' becomes 'fly' (I am not sure about this - if you are sure you should believe this answer much more).
'bird of prey?' becomes 'kite' (kite is a kind of bird of prey).
'fly'+'a'+'kite'='FLY A KITE'
Can you help me to learn more?
(Other definitions for fly a kite that I've seen before include "Test opinion by circulating rumours" , "Pilot" , "What co-pilots do" , "Release information to test public opinion" .)