A scare, perhaps, for an ancient Roman (6)
I believe the answer is:
caesar
'an ancient roman' is the definition.
'Caesar' can be an answer for 'roman' (Caesar is an example). I am not sure about the 'an ancient' bit.
'a scare perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'a'+'scare'='ascare'
'ascare' is an anagram of 'CAESAR'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for caesar that I've seen before include "See 12" , "He was killed during the Ides of March" , "Roman ruler" , "extraction operation" , "US comedian" .)