One who is stupid uses cell incorrectly (8)

I believe the answer is:

clueless

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'one who is stupid' is the definition.
The definition suggests an adjective which matches the answer.

'uses cell incorrectly' is the wordplay.
'incorrectly' is an anagram indicator (I've seen this in other clues).
'uses'+'cell'='usescell'
'usescell' is an anagram of 'CLUELESS'.

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(Other definitions for clueless that I've seen before include "Lacking in ideas" , "Stupid (so unable to do crossword?)" , "like a crossword setter getting stuck?" , "how I started this puzzle!" , "Totally uninformed about what's going on" .)

I've seen this clue in The Irish Times.

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