Princess who was popular in the Canadian army (5)

I believe the answer is:

diana

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

'princess who was popular' is the definition.
'diana' can be an answer for 'princess' (Princess Diana, 1961-1997). I'm unsure of the rest of the definition.

'in the canadian army' is the wordplay.
'in' indicates a hidden word.
'DIANA' is hidden in the letters of 'canadian army'.

Can you help me to learn more?

(Other definitions for diana that I've seen before include "Roman godess of the hunt" , "female" , "MONKEY" , "Roman goddess of the moon and the hunt" , "Roman goodess of hunting or tragic English princess" .)

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