Doctor! I spy Lou in devoted manner (7)

I believe the answer is:

piously

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'doctor i spy lou in devoted manner' is the definition.
I can't tell whether this definition defines the answer.

'doctor i spy lou' is the wordplay.
'doctor' indicates anagramming the letters.
'i'+'spy'+'lou'='ispylou'
'ispylou' is an anagram of 'PIOUSLY'.

Can you help me to learn more?

(Other definitions for piously that I've seen before include "How to pray" , "In holy manner" .)

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

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