Command in Word erroneous (5)
I believe the answer is:
order
'command' is the definition.
(I know that command is a kind of order)
'in word erroneous' is the wordplay.
'in' says the answer is hidden in the clue.
'ORDER' is hidden within 'word erroneous'.
(Other definitions for order that I've seen before include "American helping" , "Command; neatness" , "Issue a command" , "Directive or society" , "Tell - regulate" .)