No 13775, Monday 30 Jan 2023, Avtaar

Congrats to Avataar for his Half Century in The Hindu.

Solution to 1A has been deliberately left unsolved and is to be answered only by a non-regular / novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.

ACROSS

1   One among every other feline gets lost (7) ?O?L?R? (Addendum - FORLORN - {F or L or N} - See comments)

5   Nobleman in Paris who visits another planet (7) MARQUIS {MAR{QUI}S}

10 Flatness, oddly, in propellers (4) FANS {FlAtNeSs}

11 Veteran international loads semi-automatic pistols just right (10) GOLDILOCKS {G{OLD}{I}LOCKS}

12 Revolutionary work in alternative medicine (6) POTION (OP<=TION)

13 Moderate leader of India welcomed by comrade recently (8) PALLIATE {PAL}{L{In..a}ATE}

14 Flatland in Palo Alto, almost completely destroyed (9) ALTIPLANO {IN+PALO+ALTo}*

16 Peasant from backward district in Maharashtra (5) KISAN<= 

17 Quick! Say,"Cheese" before start of filming (5) BRIEF {BRIE}{Fi...g}

19 Squad captivated by how Detective Sergeant cracked murder cases (9) WHODUNITS {UNIT} in {HOW+DS}*

23 Iron strap reflecting "L" carried by beginner (4-4) GOLF-CLUB {FLOG<=}{C{L}UB}

24 Very old, large bird echoing sound (6) VOLUME {V}{O}{L}{EMU<=}

26 Long off? (10) SABBATICAL [CD]

27 Division backing king (4) FORK {FOR}{K}

28 Sex joints getting aired, apparently (2,5) IT SEEMS {IT}{SEEMS(~seams)}

29 Squeeze lock to eavesdrop, says Spooner (4,3) BEAR HUG (~hair bug to bear hug)

DOWN

2   Where one may find films enjoying a good run (2,1,4) ON A ROLL [DD]

3   Unlimited vintage drink (5) LASSI cLASSIc

4   Trendy, majestic clothes of the Queen (7) REGINAL {REG{IN}AL}

6   Commercial featuring carefree life away from home (6) AFIELD {A{LIFE*}D}

7   Incomplete citation by Indian nationalist put out in daily (9) QUOTIDIAN {QUOTe}{InDIAN}

8   African politicians drink at Hampstead bars (7) INKATHA [T]

9   New black sat phone? Congratulations! (4,2,3,4) SLAP ON THE BACK*

15 Story by popular English fellow is beyond description (9) INEFFABLE {FABLE}<=>{IN}{E}{F}

18 Warning to stop terrible, unending atrocity (4,3) RIOT ACT ATROCITy* Semi&lit

20 Delegate's review of electric vehicle - much adored (7) DEVOLVE {EV}{LOVED}<=

21 In the Philippines, wild buffalo is detained by gnu - a ram attacks from below (7) TAMARAU [T<=]

22 Donald Thomas, after cutting hands badly, drops a drink (3,3) OLD TOM {dOnaLD+ThOMas}

25 Long-time prisoner initially locked-up in farmhouse escapes resourcefully (5) LIFER Acrostic

Reference List

Who in French = QUI, International = I, Detective Sergeant = DS, Very = V, Old =O, Large = L, King = K, Sex = IT, Trendy = IN, Commercial = AD, Nationalist = N, Popular = IN, English = E, Fellow = F, Electric vehicle = EV