Comprehensive to visit informally when head departs (3-5)

I believe the answer is:

all-round

I'm a little stuck... Click here to teach me more about this clue!

'comprehensive' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for all-round that I've seen before include "Not specialised, like versatile athlete" , "General, not specialised in ability" , "A doll run (anag.)" , "Comprehensive" , "Including; complete" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app