Possible Clues:

• Period for making an egotist?
• Development of military base after, for instance, rising
• By the sound of it, making a joke, perhaps, of this development
• It might perhaps sound like the makings of a joke to be in the womb
• There's development,back for instance for the railways there
• Development (in womb)
• Period of development
• Back, for example and stop development
• In period of development, for example, put up base
• Get wasting time where train stops in period of expectancy