Long-winded clues from Incognito, enjoyable all the same.
ACROSS
1, 19 Book first transmission from a satellite about grounding of a bird (3,5,3,6) THE EAGLE HAS LANDED [DD]
5 Billy Bunter’s a creature of the night (3,3) THE OWL [DD]
10 Foreigner with a right (5) ALIEN {A}{LIEN}
11 Weaponry found when Royal Military Academy replaced part in
apartments (9) ARMAMENTS A(-part+rma)RMAMENTS
12 Egotist loses heart but remains self-centred (6) EGOIST EGOtIST
15 Back in Bruxelles, this place is a commuter town (5) EXURB [T<=]
17 A month earlier, National Aerospace Laboratories made an
eight-sided figure (9) OCTAGONAL {OCT}{AGO}{NAL}
19 See 1 across
20 A type of union seen in drug by-products (5) RUGBY [T]
21 Cloth portrait made by eccentric novice artists (8) VERONICA {NOVICE+RA}*
23 USAF flies this parrot around (6) RAPTOR*
27 They cool cars and heat rooms (9) RADIATORS [E]
28 A girl was out of place (5) AMISS {A}{MISS}
29 Camouflaged by mafioso, other hoodlums placate (6) SOOTHE [T]
30 Another name for 22 dn: communications sans cables (8) WIRELESS {WIRE}{LESS}
DOWN
2 Seeing one record after another, basically guess, the concluding
words found in some books (9) EPILOGUE {EP}{1}{LOG}{gUESs}
3 Female relatives mince small tuna (5) AUNTS {S+AUNT}*
4 Metal that is in the forefront (4) LEAD [DD]
6 Gardener’s lawman who, in short, sounded like a denizen of a
German city (9) HAMBURGER {HAMilton BURGER}
7 Bounce, when opening bowler went out, a small quantity (5) OUNCE bOUNCE
8 Sally sets out food for a person with high BP (4,5) LESS SALTY*
9 Distance travelled by Bob when cooking a plum diet (9) AMPLITUDE*
15 Repeat: “Malicious stuff is found in the gut” (9) ECHOVIRUS {ECHO}{VIRUS}
16 Modify thought by an organ rinse (9) BRAINWASH {BRAIN}{WASH}
18 Spooner treated light knife for evening entertainment (9) NIGHTLIFE {(-l+n)NIGHT(kn+l)LIFE}
22 Method of communication where a small advertisement is placed in
Portuguese river (5) RADIO {R{AD}IO}
24 Not asleep after a death ceremony (5) AWAKE {A}{WAKE}
25 Ornamental ceiling fittings look like flowers (5) ROSES [DD]
26 Spore cells of fungi initially found at Administrative Staff
College of India (4) ASCI {A}{S}{C}{I}