Daily Express

[gard-ener]

15 across Additional name or epithet given to recognize a feat, characteristic etc. as in Alexander the Great A - N - M - N

23 across anagram - Figure new down payment's typed out 7 letters

66 across anagram - One contains around forty to fifty 6 letters

[JoolsTwo]

15a Agnomen?

[slightlydazed]

23 across - snowman - the letters from 'downpayments' minus the letters from 'typed', then re-arrange
66 across - parcel - the answer to 40 across is caper, add L for fifty and re-arrange

[gard-ener]

Brilliant - I would never have got 66 across. Thanks a lot.