Stuck-up current painter abruptly ending creepy call (4,7)

'creepy call' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?

'stuck-up current painter abruptly ending' is the wordplay.
'stuck up' says the letters should be written in reverse.
'current' becomes 'flow' (synonyms).
'painter abruptly' becomes 'whistle' (I can't explain this - if you can you should give a lot more credence to this answer).
'ending' means one lot of letters go next to another.
'flow' backwards is 'wolf'.
'wolf'+'whistle'='WOLF-WHISTLE'

Can you help me to learn more?