Crossword Genius

Dad's fun paperback to take on holiday? (8)

Ross

I believe the answer is:

passport

I'm a little stuck... Click here to teach me more about this clue!

'paperback to take on holiday?' is the definition.
I can't judge whether this defines the answer.

'dad's fun' is the wordplay.
'dad's' becomes 'pa's' (both can mean one's father).
'fun' becomes 'sport' (synonyms).
'pas'+'sport'='PASSPORT'

Can you help me to learn more?

(Other definitions for passport that I've seen before include "This ensures admission" , "Document facilitating travel" , "Traveller's ID" , "entry permit?" , "Traveller's aid" .)

I've seen this clue in The Independent.
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