1: Mineral springs start to moderate involuntary muscular contraction (5)

4: Solo, the pilot rises? No way (3)

6: Not moving yet (5)

7: And not in town, ordinarily (3)

8: Most popular batter rested in dugout at last (9)

10: Period email feature (3)

12: Historic mission -- part of uprising Mexico maladministered (5)

14: Chatter about some pay-back (3)

15: Proficient in arithmetic, starting with short division (5)

1: Walesa still embodies how Nobel Laureates soar? (3)

2: She used to be called Celia (5)

3: Play with exaggerated emotions made moral play (9)

4: No one told sister (3)

5: Wooded hillock forming part of Arthur's territory (5)

8: Roosevelt's undergarment? (5)

9: Belated top-and-tailing to gladden one's heart (5)

11: Perfect counter-spy equipment (3)

13: Choose to take the top off (3)