Protested against one given collection by that man from department (9)

'protested' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

'against one given collection by that man from department' is the wordplay.
'against' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'collection' indicates an anagram (the same collection of letters).
'by' means one lot of letters go next to another.
'that man from department' becomes 'hed' (I can't justify this - if you can you should give a lot more credence to this answer).
'given' with letters rearranged gives 'nveig'.
'i' next to 'nveig' is 'inveig'.
'inveig'+'hed'='INVEIGHED'

Can you help me to learn more?