Rage of nurse when Romeo's invited in (5)

I believe the answer is:

trend

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'rage of nurse' is the definition.
'trend' can be an answer for 'rage' (thesaurus). I'm not sure about the 'of nurse' bit.

'romeo's invited in' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'invited' becomes 'tend' (I can't explain this - if you can you should believe this answer much more).
'in' means one lot of letters goes inside another.
'r' placed inside 'tend' is 'TREND'.

'when' is the link.

Can you help me to learn more?

(Other definitions for trend that I've seen before include "Prevailing tendency" , "Fashion; general direction" , "turn" , "Leaning; fashion" , "Prevailing direction" .)

I've seen this clue in The Telegraph.

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