Plant in secluded place around running water (10)

I believe the answer is:

cornflower

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

'plant in' is the definition.
'cornflower' can be an answer for 'plant' (I've seen this before). I am not certain of the 'in' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cornflower that I've seen before include "Bloomer" , "Bluebottle" , "Bloom" , "plant" , "Beautiful weed" .)

I've seen this clue in The Independent.

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