Don't mind so much, being slapdash (8)
I believe the answer is:
careless
'being slapdash' is the definition.
(similar in meaning)
'don't mind so much' is the wordplay.
I cannot quite see how this works, but
'mind' could be 'care' (I've seen this before) and 'care' is located in the answer.
The remaining letters 'less' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for careless that I've seen before include "Inattentive to one's work" , "Slapdash" , "Lax" , "Inattentive - nonchalant" , "Marked by lack of attention" .)