Break off communication and keep in suspense (6)

I believe the answer is:

hangup

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'break off' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'communication and keep in suspense' is the wordplay.
'communication' becomes 'up' (I am not sure about this - if you are sure you should believe this answer much more).
'and' means one lot of letters go next to another.
'keep in suspense' becomes 'hang' (I've seen this in another clue).
'up' put after 'hang' is 'HANGUP'.

Can you help me to learn more?

(Other definitions for hangup that I've seen before include "problem" , "To finish 22 [TRUNK CALL] perhaps" .)

I've seen this clue in The Irish News.

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