Crossword Genius

Initially so passive, I perk up as spring goes on (8)

Ross

I believe the answer is:

spirally

'as spring goes on' is the definition.

'initially so passive i perk up' is the wordplay.
'initially' suggests taking the first letters.
'perk up' becomes 'rally'.
The initial letters of 'so passive' is 'sp'.
'sp'+'i'+'rally'='SPIRALLY'

I've seen this clue in The Guardian.
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