Derision upsets Raymond Burrs detective (8)

I believe the answer is:

ironside

I'm a little stuck... Click here to teach me more about this clue!

'raymond burrs detective' is the definition.
I can't tell whether this defines the answer.

'derision upsets' is the wordplay.
'upsets' indicates an anagram.
'derision' with letters rearranged gives 'IRONSIDE'.

Can you help me to learn more?

(Other definitions for ironside that I've seen before include "Cromwell's soldier" , "TV cop" , "Edmund" , "sleuth" , "Armoured Cromwellian" .)

I've seen this clue in The Irish Independent.

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