Crossword Genius

Rare poem about a missing penguin? (7)

Ross

I believe the answer is:

emperor

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

'penguin?' is the definition.
(emperor penguin is a kind of penguin)

'rare poem about a missing' is the wordplay.
I cannot really understand how this works, but
'rare' could be 'r' (listed by Oxford Dictionary of Abbreviations) and 'r' is found in the answer.
an anagram of 'poem' is 'mpeo' which is present in the left over letters.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for emperor that I've seen before include "Powerful ruler" , "He rules over several states" , "Ruler of large territory" , "Sovereign - ruler" , "eg Nero" .)

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