One's therefore hugging maiden's neck (7)
I believe the answer is:
isthmus
'neck' is the definition.
(I've seen this before)
'one's therefore hugging maiden's' is the wordplay.
'one's' becomes 'I's' (Roman numeral).
'therefore' becomes 'thus' (synonyms).
'hugging' indicates putting letters inside.
'maiden' becomes 'm' (cricket abbreviation).
'thus' going around 'm' is 'thmus'.
'is'+'thmus'='ISTHMUS'
(Other definitions for isthmus that I've seen before include "Connective strip of land" , "Narrow land link" , "Narrow strip linking two larger areas of land" , "Narrow strip of land with water on two sides" , "Narrow neck of land joining two larger portions" .)