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I am stuck on two last clues and would really appreciate some help:

5dn Kind of mortar used on edges of lake (7)

I have C-E-E--

21ac Attempt to limit energy, busy with agreement (6)

I have --E-T-

21 tr-eat-y

5 c-l-ement

5 C L ement - clement - kind

Thanks for this. Sorry to be dense, I can see attempt is TRY, but how do you get EAT?

Alison,
Energy is "e", Busy with, is "at".
Not a wonderful clue!

Thanks to greedy kite, chrisg and rusty. In six minutes you have solved the clues I have been thinking about for three days.