The Guardian - Cryptic crossword No 28,138 - May 20 2020

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Clues Answers
American's sci-fi novel under construction: centre of Earth is missing! DUNE
Animal urinates over top of hedge, facing the other way SHEEP
Authorised captive queen to be dropped into English sea EMPOWERED
Bloke playing old fashionable instrument MANDOLIN
Car seen racing over 100 by groups of spectators AUDIENCES
Cat in the past goes round the bend OUNCE
Cocaine stolen by family returning to prison NICK
Conservative leader to suffer defeat? Time for recess CLOSET
Country's at home beyond spring SPAIN
English author, one left in river with powerboats? ADELEPARKS
English rock band, once big in the East? ASIA
Ground lies surrounded by water ISLE
Grown apart, as not suitable WRONG
He's ripped on the outside, one very trim SHAVE
Liberal wearing tousled hair promises to be funny HILARIOUS
Manage to exercise RUN
Mathematical symbol displayed on a blackboard NABLA
Clues Answers
Mature writing with Apple device? RIPEN
Moon about end of party, to act audaciously TRYITON
Old queen is turning brown SIENNA
Outside bird caged by old metal EXTERNAL
Plots involve danger close to Paris GARDENS
Pocket for everyone in East­bourne, say, in retirement TROUSER
Punishment for most of this cake being spongy, right? THICKEAR
Scottish hero — an expert climber? WALLACE
Seeks these at Wimbledon COURTS
Swear at dog, tips of sausages eaten CURSE
Talk with pet RABBIT
To have shown fear in checked pants CHICKENED
Wife's present: divorcing husband at one time past WERE
Woman has dirty laundry WASH
Writers' blocks NOTEPADS
£1,000 at first, young learner's car reverses, collecting debts kindly GRACIOUSLY