Aural devices assist in the trials (7-4)

I believe the answer is:
hearing-aids
'aural devices' is the definition.
'hearing aids' can be an answer for 'devices' (hearing aid is a kind of device). I'm not certain of the 'aural' bit.
'assist in the trials' is the wordplay.
'assist' becomes 'aid' (synonyms).
'in the' is an insertion indicator.
'trials' becomes 'hearings' (legal hearings).
'aid' inserted into 'hearings' is 'HEARING-AIDS'.
Can you help me to learn more?
I've seen this clue in The Irish News.
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