Add T as a prefix to the first word and you get the second word.
-1. T with precipitation makes a popular form of transport. 5 letters
-2. T and a gun are very little. 6
-3. T with rest is to playfully torment. 5
-4. T with a circular current of water is a woolly toy bear. 5
-5. T with a beverage makes a story. 4
6. T with a polite request is hard labour. 4
7. A craft and T make a delicious pie. 4
-8. T with a figure in geometry makes a confused interwoven mass. 6
-9. T with everything gains in height. 4
-10. T with recklessness is pure rubbish. 5