At first, I'm hazy
With a switch, I'm explosive
Lost at sea, I'm out of this world
Without you, I'll be taught
What am I?
I think at first you are
UNCLEAR - this is hazy
With a switch, I'm explosive
NUCLEAR - switched N and U
Lost at sea, I'm out of this world
UNREAL - lost C and anagrammed
Without you, I'll be taught
LEARN - now removed U and anagrammed.