Money demanded by the Romans perhaps? (6)
I believe the answer is:
ransom
'money demanded' is the definition.
'romans perhaps?' is the wordplay.
'perhaps?' indicates anagramming the letters (I've seen 'perhaps' mean this).
'romans' is an anagram of 'RANSOM'.
'by the' is the link.
(Other definitions for ransom that I've seen before include "Buy freedom" , "Ready to release prisoner" , "Go beyond (a level)" , "Money demand" , "Payment demanded for release of captive" .)