One of six in this clue (4)
I believe the answer is:
word
'one of six in this clue' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for word that I've seen before include "See 21" , "Brief statement" , "Statement; signal" , "usually comes with more than one letter" , "Device for typing, data storage etc" .)