Wrongfully obtains ten otters, illegally! (7)
I believe the answer is:
extorts
'wrongfully obtains' is the definition.
'extorts' can be an answer for 'obtains' (extorting is a kind of obtaining). I'm not certain of the 'wrongfully' bit.
'ten otters illegally' is the wordplay.
'ten' becomes 'X' (Roman numeral).
'illegally' is an anagram indicator (not in the proper order).
'x'+'otters'='xotters'
'xotters' is an anagram of 'EXTORTS'.
Can you help me to learn more?
(Other definitions for extorts that I've seen before include "Obtains by force or intimidation" , "squeezes" , "Obtains money with menaces" , "Gains by force" , "Gains by threats" .)