Crossword Genius

Modern day teacher's computer accessory (3-2)

Ross

I believe the answer is:

add-on

'computer accessory' is the definition.
(add-on device for a computer)

'modern day teacher's' is the wordplay.
'modern day' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'teacher' becomes 'don' (don is a kind of teacher).
'ad'+'don'='ADD-ON'

(Other definitions for add-on that I've seen before include "Feature supplementing standard model" , "Extra bit" , "Computer optional extra" , "Computer peripheral" , "Feature bolted on to a standard model or package" .)

I've seen this clue in The Independent.
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