Tummy-related parts of Olga's tricycle (7)

I believe the answer is:

gastric

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

'tummy-related parts' is the definition.
I can't tell whether this defines the answer.

'of olga's tricycle' is the wordplay.
'of' indicates the answer is hidden within the clue.
'GASTRIC' can be found hidden inside 'olgas tricycle'.

Can you help me to learn more?

(Other definitions for gastric that I've seen before include "Intestinal" , "Relating to or involving the stomach" , "Stomachic" , "affecting stomach" , "Abdominal" .)

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

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