Insisting on something being difficult (9)
I believe the answer is:
demanding
'difficult' is the definition.
(associated in meaning)
'insisting on something being' is the wordplay.
I cannot really understand how this works, but
'being' could be 'man' (human being) and 'man' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for demanding that I've seen before include "Requiring much effort" , "Stringent" , "Exigent" , "Requesting" .)