No power in bass for Flower of Scotland (3)

I believe the answer is:

dee

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'flower of scotland' is the definition.
'dee' can be an answer for 'flower' (River Dee). I am unsure of the 'of scotland' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dee that I've seen before include "Chester's river" , "River name" , "Welsh banker?" , "River at Chester" , "Scottish river" .)

I've seen this clue in The Times and The Sun.

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