Crossword Genius

Although poor he's rich in treasure (7)

Ross

I believe the answer is:

cherish

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

'treasure' is the definition.
(I know that treasure can be written as cherish)

'although poor he's rich in' is the wordplay.
'although' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'poor' is an anagram indicator.
'in' indicates putting letters inside.
'he'+'rich'='herich'
'herich' anagrammed gives 'cherih'.
's' put into 'cherih' is 'CHERISH'.

Can you help me to learn more?

(Other definitions for cherish that I've seen before include "Love" , "Protect and care for lovingly" , "Protect and treat with affection" , "Hold dear, keep in one's heart" , "Hold dear, treasure" .)

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