Doctor pinch dory? Nothing in it showing special cultivation method? (10)

I believe the answer is:

hydroponic

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'in it showing special cultivation method?' is the definition.
I can't tell whether this defines the answer.

'doctor pinch dory? nothing' is the wordplay.
'doctor' is an anagram indicator.
'nothing' becomes 'O' (looks like zero - 0).
'pinch'+'dory'+'o'='pinchdoryo'
'pinchdoryo' anagrammed gives 'HYDROPONIC'.

Can you help me to learn more?

(Other definitions for hydroponic that I've seen before include "wet bed?" , "Growing without soil" .)

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

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