Tutorial more available? (6)

I believe the answer is:

lesson

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'tutorial' is the definition.
(I've seen this before)

'more available?' is the wordplay.
'more' becomes 'less' (I can't justify this - if you can you should believe this answer much more).
'available?' becomes 'on' (on can mean activated or available).
'less'+'on'='LESSON'

Can you help me to learn more?

(Other definitions for lesson that I've seen before include "Portion of the scriptures read in church" , "Spell of instruction" , "Teaching unit" , "Period of learning" , "15 down period" .)

I've seen this clue in The Telegraph.

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