Endlessly more reckless at some top spots (6)
I believe the answer is:
rashes
'spots' is the definition.
(I've seen this before)
'endlessly more reckless at some top' is the wordplay.
'endlessly' means to remove the last letter.
'more reckless' becomes 'rasher' ('rash' can be a synonym of 'reckless').
'at' is a charade indicator (letters next to each other).
'top' says to take the initial letters.
The initial letter of 'some' is 's'.
'rasher' with its last letter taken away is 'rashe'.
'rashe'+'s'='RASHES'
(Other definitions for rashes that I've seen before include "Outbreaks of spots on skin" , "Eruptions of spots on the skin" , "Red eruptions of the skin" , "Shares with pimply outbreaks" , "Skin marks caused by allergies etc" .)