Working with Charlie, everyone standing by (2,4)
I believe the answer is:
on call
'standing by' is the definition.
(someone on call is standing by to help)
'working with charlie everyone' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'with' says to put letters next to each other.
'charlie' becomes 'C' (phonetic alphabet).
'everyone' becomes 'all' (all people).
'on'+'c'+'all'='ON CALL'
(Other definitions for on call that I've seen before include "ready to respond" , "Contactable" , "Able to be contacted, like a GP" , "Available if needed" , "Like a doctor, perhaps" .)