Crossword Genius

Call with less sensitive set of digits (5,6)

Ross

I believe the answer is:

phone number

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'call with less sensitive set of digits' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'call with less sensitive' is the wordplay.
'call' becomes 'phone' (synonyms).
'with' means one lot of letters go next to another.
'less sensitive' becomes 'number' (I've seen this before).
'phone'+'number'='PHONE NUMBER'

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I've seen this clue in The Mirror.
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