Purposeless commercial break (6)

I believe the answer is:

adrift

'purposeless' is the definition.
('adrift' can be similar in meaning to 'purposeless')

'commercial break' is the wordplay.
'commercial' becomes 'ad'.
'break' becomes 'rift' (I've seen this before).
'ad'+'rift'='ADRIFT'

(Other definitions for adrift that I've seen before include "like Mary Celeste?" , "Loose from moorings" , "Wandering aimlessly" , "out of touch" , "Floating unattached as at sea" .)

I've seen this clue in The Times.

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