Staff claim changes, in disputatious style (9)

I believe the answer is:

polemical

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'staff claim changes in disputatious style' is the definition.
I can't judge whether this defines the answer.

'staff claim changes in' is the wordplay.
'staff' becomes 'pole' (I've seen this before).
'changes' is an anagram indicator.
'in' is an insertion indicator.
'claim' with letters rearranged gives 'mical'.
'pole' placed within 'mical' is 'POLEMICAL'.

Can you help me to learn more?

(Other definitions for polemical that I've seen before include "Involving controversy" , "Disputed" , "Engaging in controversial debate" , "provoking argument" .)

I've seen this clue in The Independent.

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