Plenty of old strippers endlessly abused, ending in poverty (10)
I believe the answer is:
'plenty' is the definition.
'old strippers endlessly abused ending in poverty' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'endlessly' means to remove the last letter.
'abused' is an anagram indicator.
'ending in' indicates one should take the final letters.
The last letter of 'poverty' is 'y'.
'ostrippers' with its final letter taken away is 'ostripper'.
'ostripper' with letters rearranged gives 'prosperit'.
'of' is the link.
(Other definitions for prosperity that I've seen before include "wealth" , "Things going well" , "Financial success" .)