1: Period email feature (3)
2: Therefore, finish off this bit of work (3)
3: Oxygen is pretty amusing. (3)
4: A slight possibility of actor Jackie taking one's place in office (3,6)
5: Sailor takes gym class to slim down (5)
6: Mr Stewart on the staff (3)
7: Inspects old radical for a moment (5, 6)
8: Sly dog covers horses for dancers (3-8)
11: Conclude a recitation off-key (11)
12: Mend a split state (11)
13: English poet writes about head of Scottish queen (7)
15: Looked up to maid turning scarlet (7)
18: Stormy Toccata in A might be best music for one in this state. (9)
22: Gantry in Hilton Hotel, Mermaid Beach (5)
25: A representative may be a scamp (3)
26: Now Elton heard California's big one (3)
27: Compete with life in France (3)
28: Pronounced ability to smell negative votes (3)