Sid got up, nuts about those uncovered (7)
I believe the answer is:
nudists
'those uncovered' is the definition.
I can't tell whether this definition defines the answer.
'sid got up nuts about' is the wordplay.
'got up' says the letters should be written backwards.
'about' indicates putting letters inside.
'sid' reversed gives 'dis'.
'dis' going inside 'nuts' is 'NUDISTS'.
Can you help me to learn more?
(Other definitions for nudists that I've seen before include "they're not in gear" , "exposed people" , "they reveal all" , "Things abandoned by those" , "They're exposed" .)