Plug breach at sea (6)

I believe the answer is:

adrift

'at sea' is the definition.
(I've seen this before)

'plug breach' is the wordplay.
'plug' becomes 'ad' (Advertisement plugs products).
'breach' becomes 'rift' (I've seen this before).
'ad'+'rift'='ADRIFT'

(Other definitions for adrift that I've seen before include "Undirected" , "Off course" , "without guidance?" , "'Floating without direction, not tied up (6)'" , "No longer fixed in position" .)

I've seen this clue in The Telegraph.

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