Crossword Genius

College backing up reserve computer (8)

Ross

I believe the answer is:

notebook

'computer' is the definition.
(type of portable computer)

'college backing up reserve' is the wordplay.
'college' becomes 'eton' (Eton College, English private school).
'backing up' is a reversal indicator.
'reserve' becomes 'book' (to book something is to reserve it).
'eton' written backwards gives 'note'.
'note'+'book'='NOTEBOOK'

(Other definitions for notebook that I've seen before include "Token boo as in pocket recorder with blank pages (8)" , "What's associated with reporter" , "Jotter's accessory?" , "little computer" , "Bigger than diary, smaller than laptop" .)

I've seen this clue in The Telegraph.
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