1: Some unpretentious language! (5)
2: Defender is the one admitting to moving goalpost (9)
3: Rev. Spooner says 'The person massaging Reagan is illiterate' (3-6)
4: I'm great novel detective (7)
5: The Girl Guides show how to start a fire (7)
6: Fur seal frolicking around entrance to bay (5)
7: Goddess is against holding back one Quebecoise (5)
10: The lady's also returning inside for hecklers (7)
12: Parking likely to be easily adaptable (7)
14: Copiers of Indians' top batter: Maris, Ott (9)
15: Family member suppresses a temptation to go head-to-foot naked (2,7)
17: Gold tooth, perhaps, in satellite? (7)
18: Initials of buddy in radio band (7)
19: Some people differ about Castro (5)
20: War or piecemeal missile (5)
21: Gloomy semi-dull firmament (5)