Standard of living (5,3,6)

I believe the answer is:

bread and butter

I believe this is a double definition.

'standard' is the first definition.
(I've seen this before)

'living' is the second definition.
(synonyms)

'of' is the link.

(Other definitions for bread and butter that I've seen before include "sandwiches?" , "pudding" , "Food" , "basic course" , "rather monotonous diet" .)

I've seen this clue in The Sunday Times and The Times.

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