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ACROSS

7 Taxonomic classifications enrage Crick (6)

8 Imagine sparticle disappearance clearing up a mystery (6)

9 Mark the disappearance of a blood relative (4)

10 Somehow find container for little seen type of light (8)

11 Old software key ran out early, revealed protective layer (11)

14 Imply a loon ruined primary school – they have so many terms! (11)

18 Higher frequency signal to wreak havoc on integrated circuit (8)

19 Nerve fibre lost to my classification scheme (4)

20 Jo unceremoniously revealed the change in jerks over time (6)

21 10 across trap for some chemical doppelgänger (6)

DOWN

1 Bars most radiation goes around or between (7)

2 Sounds like any activated element (4)

3 Curve contains a lengthy first solution (6)

4 Upload nice if less revealing type of picture (6)

5 Tube to Northern Irish city installed first? (8)

6 Honey-coloured rock bream (5)

12 Raging tempest in western Ghana (8)

13 Submerged as odd floe melts (7)

15 American who feels a sudden pull? (6)

16 Vicious humanoid concealed STEM growth (6)

17 Forbidden to have a snake curled up inside (5)

19 Half the alphabet once thought unsplittable? (4)