1: Picture a dessert without topping (3)
2: Miserable raise follows poor grade (5)
3: Fancies and gets hard around (5)
4: Call for help oddly stops (3)
5: Conducted fight in tent, it's clear (11)
6: Bring to a close with, 'Lunatic? Me? Lunatic?!' (9)
7: Martyr fighting segregation (5,6)
10: Booster involving risk brought to a halt early form of Voyager (7)
11: I'll be stuffed if I'll deal with him!. (11)
15: Finicky person to note position we're in (7)
16: Color orange upset poet something terrible (5,4)
20: Swamp creature resting tail on a rocky outcrop (5)
23: Clean oneself, but in reverse (3)
25: Going after the final piece of puzzle for a very long time (3)