Cromwellian upset by derision (8)

I believe the answer is:

ironside

'cromwellian' is the definition.
(I have seen 'Armoured Cromwellian ' mean 'ironside' so perhaps 'cromwellian' could also mean 'ironside')

'upset by derision' is the wordplay.
'upset by' indicates anagramming the letters.
'derision' anagrammed gives 'IRONSIDE'.

(Other definitions for ironside that I've seen before include "sleuth" , "Armoured Cromwellian" , "TV cop" , "Cromwell's soldier" , "Nickname for a strong man, such as Oliver Cromwell" .)

I've seen this clue in The Irish Independent.

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