Crossword Genius

Resemblance of lithium developed inside without hydrogen (10)

Ross

I believe the answer is:

similitude

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

'resemblance' is the definition.
(thesaurus)

'lithium developed inside without hydrogen' is the wordplay.
I cannot quite understand how this works, but
'lithium' could be 'li' (chemical symbol) and 'li' is present in the answer.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for similitude that I've seen before include "Correspondence" , "Nearly identical quality" .)

I've seen this clue in The Hindu.
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