Plug breach after slipping anchor (6)

I believe the answer is:

adrift

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'slipping anchor' is the definition.
I can't tell whether this defines the answer.

'plug breach after' is the wordplay.
'plug' becomes 'ad' (as in plugging a product).
'breach' becomes 'rift' (I've seen this in another clue).
'after' means one lot of letters go next to another.
'ad'+'rift'='ADRIFT'

Can you help me to learn more?

(Other definitions for adrift that I've seen before include "Going out of control" , "Undirected" , "Aimlessly floating" , "getting nowhere?" , "Afloat without steerage" .)

I've seen this clue in the Sydney Morning Herald.

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