Strange padres had a grating effect (6)

I believe the answer is:

rasped

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'had a grating effect' 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?

'strange padres' is the wordplay.
'strange' is an anagram indicator.
'padres' anagrammed gives 'RASPED'.

Can you help me to learn more?

(Other definitions for rasped that I've seen before include "Uttered in a grating voice" , "Made harsh grating noise" , "Of voice, made a rough grating sound" .)

I've seen this clue in The Irish Independent.

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