Stupidity - don't feel so much with head (13)
I believe the answer is:
senselessness
'stupidity' is the definition.
(I've seen this before)
'don't feel so much with head' is the wordplay.
I cannot quite understand how this works, but
'feel' could be 'sense' (synonyms) and 'sense' is found in the answer.
'head' could be 'ness' (type of geographical point) and 'ness' is found in the answer.
The remaining letters 'less' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for senselessness that I've seen before include "Stupidity" , "Inanity" .)