Ultimately, number being all wrong, take one back (4,1,4)
I believe the answer is:
ring a bell
'one back' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'ultimately number being all wrong' is the wordplay.
'ultimately' indicates one should take the final letters.
'wrong' indicates anagramming the letters.
The last letter of 'number' is 'r'.
'being'+'all'='beingall'
'beingall' with letters rearranged gives 'ingabell'.
'r'+'ingabell'='RING A BELL'
'take' acts as a link.
Can you help me to learn more?
(Other definitions for ring a bell that I've seen before include "Begin to rouse memory" , "Advice to cyclist" , "jog one's memory" , "may awaken memories" , "What visitors do" .)