What lovers share left in company, stirring senses (9)
I believe the answer is:
closeness
'what lovers share' is the definition.
(lovers are close)
'left in company stirring senses' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' means one lot of letters goes inside another.
'company' becomes 'co' (abbreviation).
'stirring' is an anagram indicator.
'senses' anagrammed gives 'seness'.
'co'+'seness'='coseness'
'l' put within 'coseness' is 'CLOSENESS'.
(Other definitions for closeness that I've seen before include "State of being very near" , "Proximity" , "sense of unity" .)