Teacher steams a germ away (5,6)

I believe the answer is:

games master

'teacher' is the definition.
(games-master is a kind of teacher)

'steams a germ away' is the wordplay.
'away' indicates an anagram (letters move away from their original places).
'steams'+'a'+'germ'='steamsagerm'
'steamsagerm' anagrammed gives 'GAMES-MASTER'.

I've seen this clue in The Mirror.

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