On good terms with class, head regularly knowing enough (4-8)

I believe the answer is:

well-informed

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

'knowing enough' is the definition.
'well informed' can be an answer for 'knowing' (I've seen this before). I am not certain of the 'enough' bit.

'on good terms with class head regularly' is the wordplay.
'on good terms' becomes 'wellin' (I've seen this before).
'with' means one lot of letters go next to another.
'class' becomes 'form' (synonyms).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'head' are 'ed'.
'wellin'+'form'+'ed'='WELL-INFORMED'

Can you help me to learn more?

(Another definition for well-informed that I've seen is " Knowing the latest".)

I've seen this clue in The Telegraph.

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