Crossword Genius

Modify planet to bolster RAF or military areas (9)

Ross

I believe the answer is:

terraform

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

'modify planet' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'bolster raf or military areas' is the wordplay.
'TERRAFORM' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

'to' is the link.

Can you help me to learn more?

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