Egg obtained from four geese (4)
I believe the answer is:
urge
'egg' is the definition.
(I've seen this before)
'obtained from four geese' is the wordplay.
'obtained from' indicates a hidden word.
'URGE' can be found hidden inside 'four geese'.
(Other definitions for urge that I've seen before include "Strongly recommend; impulse" , "Encourage (to do something)" , "'Spur on, encourage (4)'" , "Impel, exhort" , "Strong, restless desire" .)