Beetle in which a Beatle started following Cliff (6)
I believe the answer is:
scarab
'beetle' is the definition.
(scarab is a kind of beetle)
'a beatle started following cliff' is the wordplay.
'started' indicates taking the first letters.
'following' says to put letters next to each other.
'cliff' becomes 'scar' (I've seen this before).
The first letter of 'beatle' is 'b'.
'a'+'b'='ab'
'ab' put after 'scar' is 'SCARAB'.
'in which' acts as a link.
(Other definitions for scarab that I've seen before include "insect" , "Beetle revered in ancient Egypt" , "Beetle, sacred to the ancient Egyptians" , "Ancient Egyptian symbol" , "Beetle revered by ancient Egyptians" .)