Crossword Genius

Gas power almost failed — almost (5)

Ross

I believe the answer is:

argon

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'gas' is the definition.
(I've seen this before)

'power almost failed almost' is the wordplay.
'power almost' becomes 'ar' (I am not sure about this - if you are sure you should believe this answer much more).
'failed' becomes 'gone' ('go' can be a synonym of 'fail').
'almost' means to remove the last letter (most of the word but not all of it).
'gone' with its last letter removed is 'gon'.
'ar'+'gon'='ARGON'

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(Other definitions for argon that I've seen before include "rare gas" , "elementary" , "Noble gas, Ar" , "Gas used in electric lights" , "Noble gas used in light bulbs" .)

I've seen this clue in The Times.
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