You don't really need a /clearfocus, because you're doing a /focus which will overwrite/clear whatever you had before.

The assist is already done in the first portion.
The Do Mapped Key > FTL Assist Me > Current Window.

So you don't really need anything in the macro beyond:
/focus

The /say My Focus is %T portion, helps to troubleshoot.




I would have it:


- Do mapped key > FTL Assist Me > Current Window
- Named Macro Action > (Target is an Action Target Group, with your CC toons in it) > check round-robin.

Macro:
/focus
/say My Focus is %T.






Or, if you prefer to use the raid icons...

Mage (Slot 2) Hotkey.
- Do Mapped Key > FTL Assist Me > Current Window
- Named Macro Action > Slot 2 > Named Macro Action

Macro:
/focus
/say My Focus is %T
/run SetRaidTarget("target", 1)



Warlock (Slot 3) Hotkey.
- Do Mapped Key > FTL Assist Me > Current Window
- Named Macro ACtion > Slot 3 > Named Macro Action

Macro:
/focus
/say My Focus is %T
/run SetRaitTarget("target", 2)


The advantage of not going round-robin, is that you can choose who sets focus and who does not.
If you're on a pull where all of the mobs are undead.
Only your priest has a CC effect (Banish).
Having to set a focus on the mage, for a spell that cannot work against undead... is kind of pointless.