Become completely addled and fail to hold on (4,4,4)

'become completely' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'addled and fail to hold on' is the wordplay.
'addled' becomes 'ones' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'fail' becomes 'lose' (I've seen this in another clue).
'to hold on' becomes 'grip' ('grip' can be a synonym of 'hold on').
'ones' put after 'lose' is 'loseones'.
'loseones'+'grip'='LOSE ONES GRIP'

Can you help me to learn more?