Hi Lou57,
23D. Thrice = Times three
five = V (in roman numerals)
hundred = C (in roman numerals)
'thrive' minus 'V', plus 'C' = thrice
27D. Offspring = Kids
cancelled = off
pre-summer season = spring
33D. Servant = Help
'taverns' is an anagram of 'servant'
57D. Antonym = The opposite
'not many' is an anagram of 'antonym'
64D. Odious = Horrid
'do' return = od
notices of debt = IOU'S
Regards, Butterfly