Fine approval comes with reviewing some memory book’s contents (7-3)

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

'approval comes with reviewing some memory book's contents' is the wordplay.
'approval' becomes 'tick' (I can't justify this - if you can you should give a lot more credence to this answer).
'comes with' says to put letters next to each other.
'reviewing' says the letters should be written in reverse (I've seen 'reviewed' mean this).
'some memory' becomes 'byte' (byte is a unit of memory size).
'contents' says to take the centre (I've seen 'content' mean this).
The central letters of 'book' are 'oo'.
'byte' written backwards gives 'etyb'.
'tick'+'etyb'+'oo'='TICKETY-BOO'

Can you help me to learn more?