Crossword Genius

Rare element of sexual excite­ment with female — I'm keeping out, essentially (9)

Ross

I believe the answer is:

ruthenium

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

'rare element' is the definition.
'ruthenium' can be an answer for 'element' (ruthenium is a kind of element). I'm not certain of the 'rare' bit.

'sexual excitement with female i'm keeping out essentially' is the wordplay.
I cannot quite see how this works, but
'female' could be 'hen' (female chicken) and 'hen' is present in the answer.
'i'm' could be 'i' (I've seen this in other clues) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'of' acts as a link.

Can you help me to learn more?

(Other definitions for ruthenium that I've seen before include "element" , "metal" .)

I've seen this clue in The Guardian.
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