Second little creature? That's right! (4)
I believe the answer is:
tick
This clue is a triple definition!
'second little' is the first definition.
'tick' can be an answer for 'second' (both can mean a very short amount of time). I'm not sure about the 'little' bit.
'creature?' is the second definition.
(tick is a kind of creature)
'that's right' is the third definition.
(a tick can indicate a correct answer)
Can you help me to learn more?
(Other definitions for tick that I've seen before include "Beat" , "Make noise like old clock" , "Sound of an old watch" , "Not cross" , "Check the small mattress?" .)