Many thanks for this Jolan. Such a treat to have a free Tuesday afternoon to give your delightful clues a try.
Here are my stabs at them.
1. Charge in to dry up tar (8)
Seafarer?
Charge – “fare” inside to dry up – “Sear” gives “sea fare r” – a tar?
2. Foil, say, transforming window-pane while keeping out air in motion? (6)
Baffle?
To baffle is to foil and a baffle is used on window panes to keep out light and generally is used for “keeping out air in motion”?
2. In order to trap a warthog, I bide my time, hiding in the same place (6)
Ibidem?
Latin for “in the same place” and is hidden in clue?
3. Publicly caress money connected to crack (8)
Lollygag?
Money – “Lolly” is connected to crack – “gag” to give “lollygag” in Chambers as “to caress publicly”?
4. Brave child, going inside a model representing the scene of Christ's nativity (5) Long shot-
Carib? A Carib is an American Indian or “brave” with “a” going inside model of Christ’s nativity – crib?