Crossword Genius

Authorisations of dad's frolics? (9)

Ross

I believe the answer is:

passports

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'authorisations' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'dad's frolics?' is the wordplay.
'dad's' becomes 'pa's' ('pa' can be a synonym of 'dad').
'frolics?' becomes 'sports' ('sport' can be a synonym of 'frolic').
'pas'+'sports'='PASSPORTS'

'of' is the link.

Can you help me to learn more?

(Other definitions for passports that I've seen before include "Authorisations to travel abroad" , "Documents allowing travel" , "Having admission documents" , "Authorisation to travel" , "Government documents needed for foreign travel" .)

I've seen this clue in The Telegraph.
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