The Guardian - Quick crossword No 15,932 - May 31 2021

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Clues Answers
Colourless gas used as fuel, C2H6 ETHANE
Bits of uneaten cake — I'm surprised! CRUMBS
Black tie or smart casual, for example DRESSCODE
Block of ice CUBE
Burst into flames IGNITE
Coolness under pressure SANGFROID
Fixed IMMOBILE
Gloom MURK
In a way SORTOF
In an earliest stage — evil ramp (anag) PRIMEVAL
Clues Answers
Ingratiating SMARMY
Join the ends together SPLICE
Prepare for an exam REVISE
Rational SANE
Regulars — consumers CUSTOMERS
Share set aside ALLOTMENT
Skin treatment FACEPACK
Tobacco user SMOKER
Tree branch LIMB
___ in Blue, 1924 George Gershwin composition RHAPSODY