1a Leg, small gift at the present time (8,6)
Myra is correct - it's time for presents, not time now
4d Marine is coming from Saint Lucia at sea (8)
5d Polish language (6)
14d Artists sharing same approach with ringer, it marks end of period (6-4)
Yes, it is SCHOOL-BELL - the reference is to any one of a number of schools of painters
I'll let someone else have a go at the others, but 4 down was one of my favourites!