Clue: 7's 24 1 8 5 17 after 18, one hundred and ten? (7)
Answer: ANTONIO
Explanation: Definition: 7's 24 1 8 5 17 after 18
AN (one) + TON (100) + IO (10) – the numbers give PIERRE'S SEA AIR FROM VERY BEAT-UP NIECE after THE, which is THE MER CHANT ("sea song/air" in French + OF (from) + V[ery] + ENICE (anagram of NIECE). Antonio is the title character of *The Merchant of Venice* (not Shylock, as sometimes erroneously thought).