Crossword Genius

Expert history teacher? (4,6)

Ross

I believe the answer is:

past master

'expert' is the definition.
(I know that past master is a type of expert)

'history teacher?' is the wordplay.
'history' becomes 'past' (I've seen this in another clue).
'teacher?' becomes 'master' (I've seen this before).
'past'+'master'='PAST-MASTER'

(Other definitions for past master that I've seen before include "wizard" , "Thomas Arnold was" , "seen at staff reunions?" , "Someone with a long and thorough experience in a given activity" , "Person experienced in a particular field" .)

I've seen this clue in The Telegraph.
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