Red spots on head showing lack of care (8)
I believe the answer is:
rashness
'lack of care' is the definition.
(being rash is acting without proper care)
'red spots on head' is the wordplay.
'red spots' becomes 'rash' (I've seen this before. I am not sure about the 'red' bit.).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'head' becomes 'ness' (ness is a headland).
'rash'+'ness'='RASHNESS'
'showing' is the link.
Can you help me to learn more?
(Other definitions for rashness that I've seen before include "Impulsiveness" , "Temerity" , "Lack of caution" , "Imprudence" , "Audacity" .)