One point harangue is rootless (9)

I believe the answer is:

itinerant

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

'one point harangue' is the wordplay.
'one' becomes 'i' (Roman numeral).
'point' becomes 'tine' (I've seen this in another clue).
'harangue' becomes 'rant' (synonyms).
'i'+'tine'+'rant'='ITINERANT'

'is' is the link.

Can you help me to learn more?

(Other definitions for itinerant that I've seen before include "Moving from place to place" , "Wanderer" , "Old labourer/traveller who travelled from place to place" , "Tramp" , "Rambling" .)

I've seen this clue in The Independent.

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