Posh lass hiding fling with general (6)
I believe the answer is:
global
'general' is the definition.
(thesaurus)
'posh lass hiding fling' is the wordplay.
'posh lass' becomes 'gal' (upper-class pronunciation of 'girl').
'hiding' is an insertion indicator.
'fling' becomes 'lob' (I've seen this before).
'gal' placed around 'lob' is 'GLOBAL'.
'with' acts as a link.
(Other definitions for global that I've seen before include "all over the place" , "Sphere-shaped" , "Going round the world" , "Across our planet" , "Like big village" .)