Leave fellows needing time in division of company (10)
I believe the answer is:
department
'division of company' is the definition.
(part of a company or institution)
'leave fellows needing time' is the wordplay.
'leave' becomes 'depart' (synonyms).
'fellows' becomes 'men' (fellow can mean a man).
'needing' says to put letters next to each other.
'time' becomes 't' (abbreviation).
'depart'+'men'+'t'='DEPARTMENT'
'in' is the link.
(Other definitions for department that I've seen before include "Ministry" , "not the whole company" , "Division of a large organisation" , "Organisational division" , "Moselle, perhaps" .)