47d) Tenancy (6) T?N?RT
2d) Distorted portrait (10) C?O?K??U?E
4d) Official cancellation (9) A?M?L?E?T
88d) Consternation (9) A?A?E?E?T, I thought awareness but last T is from 115a) Trying(10) to which I put aTtempting?
<Sorry don't understand where tarn came in? >
You were looking for a word with 4 letters meaning lake. A tarn is a lake. But it was a guess as you hadn't told us your letters.