One not that famous in a painful spot (7)
I believe the answer is:
blister
'a painful spot' is the definition.
'one not that famous' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'li' (I've seen this in other clues) and 'li' is present in the answer.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for blister that I've seen before include "that's swelled up" , "Friction bubble on skin" , "Bubble raised on the skin" , "Result of friction" , "Bubble on the skin filled with fluid" .)