Follow the last bit (4)
I believe the answer is:
tail
This might be a double definition.
'follow' is the first definition.
(both can mean to chase or pursue)
'last bit' is the second definition.
'tail' can be an answer for 'last' (thesaurus). I am unsure of the 'bit' bit.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for tail that I've seen before include "Elongated posterior part of an animal" , "Back end; follow secretly" , "bum" , "Follow (a suspect)" , "Follow -- rear end" .)