No 9464, Tuesday, 24 Feb 09, Nita Jaggi

Easy outing today though some of the clues I felt were innapropriate, few repetitions also which normally is never done by a compiler.
ACROSS
 1 - Gal upset after admitting the morning mischief of a get together (10) – AM{ALG*}AMATE ? Annotation for amate not clear in relation to mischief, see the meaning at the link
9 - Begin the campaign on a motorboat (6) – LAUNCH [2]
10 - Port authority has a track on the surface of an outdoor area (10) – {P}LAY{GROUND}
11 - Misguided monarch makes a loud speech (6) – ER{RANT}
12 - Charming to beat a few (7) – WIN{SOME}
16 - Odd part of nugget has a sharp point (5) – PRO{N}G ? Annotation not clear to me
17 - Left one learner at the end of the day with a white flower (4) – L{I}{L}Y
18 - Thousand in row over a big cat (5) – TI{G}ER ? Thousand should be M and not G
19 - Rodent consumes one unit of an Indian dish (5) – RA{I}T*{A} Also known as 'pachadi' to South Indians
20 - One to control an organization (4) - BOSS
21 - Tries different ceremonies (5) – RITES*
22 - Supreme Court has a chart rewritten in poor handwriting (7) – SC{RATCH*}
27 - Representations of famous people (6) – IMAGES [CD]
29 - Inappropriate international petition of an expert (10) – UN{SUIT}ABLE
30 - Device to support the queen (6) – HOLD{ER}
31 - Passes through the unusual steep coral (10) – PERCOLATES*
DOWN
 2 - Scholar has fifty pounds in the shopping complex (4) – MA{L}{L}
 3 - Pupil has a troubled year at seven levels (6) – {L}AYER*{S}
 4 - Central chamber of the heart (6) – ATRIUM [CD]
 5 - Keen for a slice of the cake layer (5) – A{CUT}E ?
 6 - Senior beheaded the worker (5) – ELDER (welder – w)
 7 - Worker, as tigon changes an opponent (10) – {ANT}AGONIST*
 8 - Snapshot of the piano on the house to plot(10) – {P}{HOTO*}{GRAPH} I presume ‘On The House’ is the origin for the anagram for OTHO though not specifically indicated by the compiler (Addendum - {P}{HO}{TO}{GRAPH})
12 - Having no doubts of the impermeable element (10) – WATERTIGHT [2]
13 - Open to discussion, information comes up in the good book for one expert (10) – {NEG*}{OT}{I}{ABLE} Expert is repeated in 29A with the same answer, normally not done by compilers
14 - A joint on the Spanish weapon (5) – EL{BOW}
15 - An explanatory phrase on superficial attractiveness (5) – GLOSS ? Annotation not clear to me
23 - Accountant has a coil twisted on the cotton cloth (6) – CA*{LICO*} Did you know the word Calico originated in Kozhikode (earlier Calicut)
24 - Painter conceals the large spa for a Hindu nymph (6) – A{PSA}R{A}
25 - Take control on America and an ancient city President (5) – US{UR}P
26 - Note the old thing taken up by the penny pincher (5) - {MI}SER Cannot explain how SER is indicated by ‘old thing taken up’
28 - Heard of an insect to disappear quickly (4) - FLEE (~flea)