Clue: Familiar name for humble member of a large organisation (women only) (8)
Answer: COGNOMEN
Explanation: Definition: Familiar name
A charade of COG ('humble member of a large organisation') plus NO MEN ('women only'). COG brings to mind that many (MANY) years ago there was in London a Business Efficiency Exhibition, for which some bright spark came up with a logo of three cogs intermeshing. Three cogs interrmeshing are completely immovable.