Crossword Genius

One, thick-skinned, who could become richer soon? (10)

Ross

I believe the answer is:

rhinoceros

'one thick-skinned' is the definition.
(thick-skinned animal)

'become richer soon?' is the wordplay.
'become' indicates an anagram.
'richer'+'soon'='richersoon'
'richersoon' with letters rearranged gives 'RHINOCEROS'.

'who could' acts as a link.

(Other definitions for rhinoceros that I've seen before include "Big game" , "Thick-skinned beast" , "Pachyderm" , "Brute" , "Ionesco play" .)

I've seen this clue in The Times.
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