Crossword Genius

Choose fancy iron, finally metric, using computer control (10)

Ross

I believe the answer is:

electronic

'using computer control' is the definition.
(controlled by computers)

'choose fancy iron finally metric' is the wordplay.
'choose' becomes 'elect' (electing is a kind of choosing).
'fancy' indicates an anagram.
'finally' says to take the final letters.
The final letter of 'metric' is 'c'.
'iron' anagrammed gives 'roni'.
'elect'+'roni'+'c'='ELECTRONIC'

(Other definitions for electronic that I've seen before include "Like a computer" , "of some modern technology" , "Like a PC" , "of PC devices?" , "Using microchips, transistors, etc" .)

I've seen this clue in The Guardian.
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