Centre symbol on card? (5)

I believe the answer is:

heart

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

This might be a double definition.

'centre symbol' is the first definition.
'heart' can be an answer for 'centre' (I've seen this before). I'm unsure of the 'symbol' bit.

'card?' is the second definition.
(the hearts are a playing card suit)

'on' acts as a link.

Can you help me to learn more?

(Other definitions for heart that I've seen before include "See 22" , "Pumping organ" , "bottle" , "Muscular organ - compassion" , "Body organ" .)

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

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