Layeggs

4 clues
Birds do it
What hens do
Birds and platypi do it
What oviparous creatures do
Similar answers:
2layer
Accountsplayable
Activeplay
Adobeflashplayer
Agametoucanplay
Agametwocanplay
Agreatplayonwords
Ahastingslayer
Aidedelayedstaidblade
Airplay
Allay
Allayed
Allayer
Allayers
Allaying
Allays
Allworkornoplay
Anchorstherelay
Andburnettplayed
Andeggs