The Guardian - Cryptic crossword No 28,259 - Oct 8 2020

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Clues Answers
Alternative fuel overwhelms fellow with unknown discharge EFFLUX
Animal around and about, adult male's lost CREATURE
Change 11p over old cover? ENVELOPE
Choose over Charlie or Michael involving a branch of science ELECTROCHEMICAL
Climbing mountains with quiet descent on landing SPLASHDOWN
Core of world back to front HEART
Director left at the end holding hard part of shoe SPIKEHEEL
Doubles taken from physicist's mug STEIN
During Great Revolt, we English can be using social media TWEETING
Encounters aliens on Earth following Martian leader MEETS
Every so often big cheat began to drink ICETEA
Has tan spoiled in afternoon shadow? PHANTASM
Heavens above! On another planet 2001 computer is law enforcer SKYMARSHAL
In court, large expense COST
Keep players on leg-side boundaries CASTLE
Clues Answers
Old queen's honest with diarist ANNEFRANK
Pillagers back up to eat snack prepared by Saxon's chief RANSACKERS
Poet recounts fifth item found on beach SHELLEY
Reportedly, get lost pastry CHOUX
Revolutionary recalls loathing for large cat CHEETAH
Rising troubles with this kind of bread SODA
Rolling Stone caught by Mr Big? Very! MONSTER
Starts to smoke, eventually saw someone tranquillised SEDATED
Teacher admits time in prison STIR
They're involved in father's Star Trek battle — once timeless PARTAKERS
Titan unearthed in built-up Rome? The usual! PROMETHEUS
To ensure sufficient funds remain below interest UNDERDRAW
Up-to-date style worn by sailors MODERN
Woman to wed right away MARY