Find an answer to each pair of clues below. And yup, all the pairs of answers share a common connection

-1. Sailor / keep back
-2. Behind schedule / having a blood connection
-3. Isolated mountain / argued against
-4. Woman of beauty and charm (not Mrs Worrier) / rose up
-5. To join or combine / declined
-6. Copy / gathered in
-7. Lever / executed a repetition of
-8. Joy / reimburse
-9. Fish / look at
-10. Rent / let go
-11. Mussolini / made smaller
-12. Meteorological phenomenon / gave delight or enjoyment to