Crossword Genius

Popular park is kept aside (2,7)

Ross

I believe the answer is:

in reserve

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

'aside' is the definition.
(synonyms)

'popular park is kept' is the wordplay.
I cannot quite see how this works, but
'popular' could be 'in' ('in' can mean trendy) and 'in' is present in the answer.
The remaining letters 'reserve' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for in reserve that I've seen before include "Held back" , "Set aside" , "available for use if needed" , "extra" , "Kept back" .)

I've seen this clue in the Sydney Morning Herald.
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