Across
1 Soft noise right outside a mail boat (6)
4 Melt granites to obtain an element like Radon (5,3)
10 Father’s clipper used as a fastener (9)
11 Tease unknown person in between (5)
12 Stall an assassin (5)
13 Maybe a goal for a gun (9)
14 Messenger is closest to our light source (7)
16 Newts in the left side (4)
19 Corrupts volatile memory counter (4)
21 God’s ratio found in fibre’s nerve centre (7)
24 Note lawsuits’ responses (9)
25 Leap over an underground burial chamber (5)
26 Dinar touched the lowest point (5)
27 Environmental group trumpeted a salad ingredient (5,4)
28 Favoured unlimited fish for a part of a course (4,4)
29 Fool around vocational college in the present situation (2,2,2,)
Down
1 Explosive spot almost fades away when mantra is introduced (4,4)
2 Cabinet committee has a sweetened beverage as a starter (8)
3 Dirt from fireplace having no roof (5) EARTH
5 Write up melody for God (7) NEPTUNE
6 Bugbane to scare head (6-3)
7 Flashy make-up, used at first, left ugly zit (6)
8 Lead pot rested on top (6) SATURN
9 Drowsy agent is taken around a shelter (6)
15 Remaining the same in unrelated manoeuvre (9)
17 Stone Open University exam is the toughest (8)
18 Decay within, plagues public demonstrations (8)
20 Organises rounds for a bunch of underlings (7)
21 Ridicule surrounding street entertainer (6)
22 University managed by us was once named after Herschel (6) URANUS
23 Gave a bit of dope swallowed by some Chinese editor (6)
25 Parvenu shockingly exposes a beautiful woman (5) VENUS