Crossword Genius

Trial organised by NHS involving complex systems of inner ear (10)

Ross

I believe the answer is:

labyrinths

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

'trial organised by nhs' is the definition.
I can't judge whether this defines the answer.

'complex systems of inner ear' is the wordplay.
'complex' becomes 'labyrinth' (I've seen this in another clue).
'systems of inner ear' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'labyrinth'+'s'='LABYRINTHS'

'involving' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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