crusader monday

[lilypoppyfre]

crusader monday 14 across sharp item thrown in the drink 5 , 2 , 5 letters
I have S _ I _ E _ F _ E _ O _


18 across ruins that make progress difficult 6 , 6 letters
I have _ A _ L _ _ _ R _ H _ S

any help please ? thank you.

[Oldred]

14a slice of lemon
18a fallen arches

[treetops1]

Slice of Lemon

[lilypoppyfre]

Thank you Oldred and Treetops1 ......I would never have found 18 across...
as it is I am now going to bag some leaves. My driveway seems to act as a tunnel for all my neighbours' trees' leaves ( that looks odd, is it good grammar ? )...It is cold but dry and I shall look forward to a steaming cup of coffee afterwards...