Uneasy over playing in hot weather, on reflection (7)
I believe the answer is:
nervous
'uneasy' is the definition.
(I know that uneasy can be written as nervous)
'over playing in hot weather on reflection' is the wordplay.
'playing' is an anagram indicator.
'in' is an insertion indicator.
'hot weather' becomes 'sun' (I have seen 'Nice weather' mean 'sun' so perhaps 'weather' could also mean 'sun'. I am not sure about the 'hot' bit.).
'on reflection' says the letters should be written in reverse.
'sun' reversed gives 'nus'.
'over' with letters rearranged gives 'ervo'.
'ervo' inserted inside 'nus' is 'NERVOUS'.
Can you help me to learn more?
(Other definitions for nervous that I've seen before include "'Apprehensive, uneasy (7)'" , "Easily alarmed" , "Worried, apprehensive" , "Fearful or apprehensive" , "stewing" .)