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Signal receivers installed ultimately put a stop to customs (9)

Ross

I believe the answer is:

dendrites

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'signal receivers' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.

'installed ultimately put a stop to customs' is the wordplay.
'ultimately' suggests the final letters.
'put a stop to' becomes 'end' (I've seen this in another clue).
'customs' becomes 'rites' (both can mean rituals or traditions).
The last letter of 'installed' is 'd'.
'd'+'end'+'rites'='DENDRITES'

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I've seen this clue in The Daily Express.
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