Weight held by any borrower of Roman ears (6)
I believe the answer is:
antony
'borrower of roman ears' is the definition.
The definition suggests a singular noun which matches the answer.
'weight held by any' is the wordplay.
'weight' becomes 'ton' (unit of weight).
'held by' means one lot of letters goes inside another.
'ton' inserted within 'any' is 'ANTONY'.
Can you help me to learn more?
(Other definitions for antony that I've seen before include "Mark . . . . . . was Cleopatra's lover" , "Mark ...... was a lover of Cleopatra" , "Shakespearean character" , "The Mark who loved Cleopatra" , "Lover of Cleopatra (Shak.)" .)