Thanks Roof,
I'm glad you and your friend stuck with it.
18d - All you letters are correct. For "our existing declaration" think if it was 'my existing' it might be "I Am" but it's "our" hence .. ?E AR? minus the last letter/'limited' and your right about the "cricket side" - for the definition "lose effect" think about the painkillers for your sore shoulder, after a while they ...... or 'lose effect.