Don't know about the rest of you, but in the situation described by eyeinthesky above (i.e. under RAS) I wouldn't use the phrase "avoiding action" unless it was exactly that: a manoeuvre to avoid collision.
Vectoring to achieve 5Nm/3000ft I would say something like "there is traffic on your current track, vectoring you around it". Non-standard, I know, but most crews seem happy with it.