Scheming to cuddle sweetheart, nude and dishevelled (8)
I believe the answer is:
slovenly
'dishevelled' is the definition.
(slovenly means dishevelled or untidy)
'scheming to cuddle sweetheart nude and' is the wordplay.
'scheming' becomes 'sly' (I've seen this in another clue).
'to cuddle' indicates putting letters inside.
'sweetheart' becomes 'love' (both are terms of address to romantic partner).
'nude' means to look at the middle letters (the word is stripped of its outer letters).
The middle letter of 'and' is 'n'.
'love'+'n'='loven'
'sly' enclosing 'loven' is 'SLOVENLY'.
(Other definitions for slovenly that I've seen before include "messy state" , "Dirty and slipshod" , "Untidy, dirty" , "Habitually dirty and unkempt" , "Untidy, careless" .)