Kind of teaching aid, as usual, I avoid changing (11)

I believe the answer is:

audiovisual

'kind of teaching aid' is the definition.

'usual i avoid changing' is the wordplay.
'changing' is an anagram indicator.
'usual'+'i'+'avoid'='usualiavoid'
'usualiavoid' with letters rearranged gives 'AUDIOVISUAL'.

'as' acts as a link.

(Another definition for audiovisual that I've seen is " such as video projections".)

I've seen this clue in The Telegraph.

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