Question

My first part sounds like what we call a person who lives in disguise;

Then comes something that is first to die and the end to end;

The last part is like the sound which is often heard in search of every unknown word.

Put it all together and answer this: which creature am I talking about?

Answer 1

Person who lives in disguise => Spy
Letter 'd' is first in die and last in end
'Err' is what we use when we are at loss for words
Combining the three gets us Spider.