Break lonely routine? No, never! (3,2,4,6)

I believe the answer is:

not on your nellie

'never' is the definition.

'break lonely routine? no' is the wordplay.
'break' is an anagram indicator.
'lonely'+'routine'+'no'='lonelyroutineno'
'lonelyroutineno' anagrammed gives 'NOT ON YOUR NELLIE'.

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app