Demand for telephonic communication (4)

I believe the answer is:

call

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This might be a double definition.

'demand for' is the first definition.
(thesaurus)

'telephonic communication' is the second definition.
'call' can be an answer for 'communication' (call is a kind of communication). I'm not certain of the 'telephonic' bit.

Can you help me to learn more?

(Other definitions for call that I've seen before include "Cry - summon" , "Telephone - give a name" , "Shout; ring" , "Ring; name" , "Ring or visit" .)

I've seen this clue in the Evening Standard.

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