Commercial break without purpose (6)

I believe the answer is:

adrift

'without purpose' is the definition.
(adrift can mean lacking purpose or direction)

'commercial break' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'break' becomes 'rift' (rift can mean a break or opening).
'ad'+'rift'='ADRIFT'

(Other definitions for adrift that I've seen before include "Undirected" , "without purpose or direction" , "Afloat without control" , "No longer fixed in position" , "Afloat without steerage" .)

I've seen this clue in The Independent and The Telegraph.

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