Hi Tyke,
17 and 18 are both what Jono now calls “ super- subs”.
Subtractive anagrams of the form: (A*-B* = C)* to give the definition. Not everyone’s cup of tea, but fun to construct.
So 17:
[( OLD YELLOW CARS TOTAL)* - (SOLD TO Y W)*]*
Write-off, amazingly, accident are the *
You to start with = Y,
Leaving out = “-“
Def = guarantee
and 18:
[( HE TELLS ROSIE ORAL ACT R)* - ( HER SISTER O)*]*
Disaster,exceptional, making are the *
Outgoing = “-“
Def = money
Hope this helps in future