Crossword Genius

When cooking up cleverer ads, you have a secret advantage (4,2,4,6)

Ross

I believe the answer is:

card up your sleeve

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

'when cooking up cleverer ads you have a secret advantage' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'when cooking up cleverer ads you' is the wordplay.
'when cooking' is an anagram indicator (cook can mean to manipulate or distort).
'up'+'cleverer'+'ads'+'you'='upclevereradsyou'
'upclevereradsyou' anagrammed gives 'CARD UP YOUR SLEEVE'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app