as other queries weren't very productive i'll try again!
1a after onset of winter ,ordinary leaves disappear 4,3 ends ?F? off?
12a origin of limp associated with shank 6 ?????L
28a spoke rudely to party leader 7 ?H?E???
25d second long quill !5 ????E
all solutions thematic,and have normal defs but in some wordplay ignores theme