A school principal some time in the future? (5)

I believe the answer is:

ahead

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

'in the future?' is the definition.
(I've seen this in another clue)

'a school principal' is the wordplay.
'school principal' becomes 'head' (synonyms).
'a'+'head'='AHEAD'

'some time' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for ahead that I've seen before include "In the future" , "in van" , "advanced" , "Forwards" , "In the leading position" .)

I've seen this clue in The Globe and Mail.

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