Wander around with mum before books launch (8)

I believe the answer is:

moonshot

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

'wander around with mum before books' is the wordplay.
'wander around with' becomes 'moon' (I can't explain this - if you can you should give a lot more credence to this answer).
'mum' becomes 'sh' (I've seen this in other clues).
'before' means one lot of letters go next to another.
'books' becomes 'ot' (Old Testament).
'moon'+'sh'+'ot'='MOONSHOT'

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(Other definitions for moonshot that I've seen before include "Launch of spacecraft to Earth's near neighbour" , "Space flight" , "Rocket launch to our nearest neighbour" , "Launching of a lunar spacecraft" , "Ambitious launch" .)

I've seen this clue in The Telegraph.

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