Crossword Genius

Notice disagreement is rootless (6)

Ross

I believe the answer is:

adrift

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'rootless' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'notice disagreement' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'disagreement' becomes 'rift' (I've seen this in other clues).
'ad'+'rift'='ADRIFT'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for adrift that I've seen before include "Loose from moorings" , "Afloat without steerage" , "out of touch" , "'Floating without direction, not tied up (6)'" , "without guidance?" .)

I've seen this clue in The Guardian.
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