Crossword Genius

I climb ice formation, being stupid (9)

Ross

I believe the answer is:

imbecilic

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

'i climb ice formation' is the wordplay.
'formation' indicates anagramming the letters.
'climb'+'ice'='climbice'
'climbice' is an anagram of 'mbecilic'.
'i'+'mbecilic'='IMBECILIC'

(Another definition for imbecilic that I've seen is " stupid".)

I've seen this clue in The Daily Express.
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