Units not completely honest (4)
I believe the answer is:
ones
'units' is the definition.
(I know this)
'not completely honest' is the wordplay.
'not completely' indicates the answer is hidden within the clue.
'ONES' can be found hidden inside 'honest'.
(Other definitions for ones that I've seen before include "1 & 1 & 1" , "Aces" , "Individuals" , "Singletons" , "Units" .)