Crossword Genius

Terrible puns -- air's becoming sort of blue (8)

Ross

I believe the answer is:

prussian

'sort of blue' is the definition.

'terrible puns air's' is the wordplay.
'terrible' indicates anagramming the letters.
'puns'+'airs'='punsairs'
'punsairs' is an anagram of 'PRUSSIAN'.

'becoming' is the link.

(Other definitions for prussian that I've seen before include "Relating to a former German state" , "Ova" , "Native of a former German kingdom" .)

I've seen this clue in The Telegraph.
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