Seize the occasion, but don't do so immediately (4,4)

I believe the answer is:

take time

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'don't do so immediately' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'seize the occasion' is the wordplay.
'seize' becomes 'take' (I've seen this before).
'the occasion' becomes 'time' (I've seen this before).
'take'+'time'='TAKE TIME'

'but' acts as a link.

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