Means of support (5,3,6)

I think it could be either:

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5,3,6

bread and butter

'means of support' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for bread and butter that I've seen before include "pudding" , "basically reliable" , "Means of support" , "Food" , "rather monotonous diet" .)

I've seen this clue in the Penny Press.

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