Keep the eggs warm (as in the kitchen?) (5)
I believe the answer is:
hatch
'keep' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for hatch that I've seen before include "serve here?" , "Deck opening; (egg) open" , "Opening < car" , "Cook up" , "Emerge from egg - opening" .)