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1 Across, Communication system trainee's out of this world (8)

5 Across, A sort of truncated diamond sphere (6)

11 Across, Metallic element radium and three rocks containing argon (4,5)

12 Across, Distances at sea represented with line? (9)

Compiler - CROSOPHILE

Many Thanks

12a alienates (anagram of at sea line)

11a rare earth - anagram of ra +three + ar

11 Rare Earth is a metallic element.

Radium would give the 'R'

Three rocks (from the Sun) would be (Planet) Earth

But that leaves Air for Argon ???

5 Domain - sphere

anagram diamon(d)

5a domain, diamon(d)*

1a: Internet = communication system (def)
intern - trainee
ET - extra terrestrial; out of this world

Should have checked my Periodic table !!!!
:-P

Please excuse my utter nonsense.
4 hrs sleep after a night-shift is not enough for me evidently.
Back to bed I go.

G'night shooty :)