Stingy workplace uses ESP. So what? (9)
I believe the answer is:
sweatshop
'stingy workplace' is the definition.
'sweatshop' can be an answer for 'workplace' (sweatshop is a kind of workplace). I am not certain of the 'stingy' bit.
'uses esp so what?' is the wordplay.
'uses' indicates anagramming the letters (I've seen 'used' mean this).
'esp'+'so'+'what'='espsowhat'
'espsowhat' anagrammed gives 'SWEATSHOP'.
Can you help me to learn more?
(Other definitions for sweatshop that I've seen before include "Exploitative factory" , "where work is hard" , "Place for wretched workers" , "where workers may be exploited" , "Factory exploiting workers" .)