New organisation on Scottish isle get to recruit guys (13)
I believe the answer is:
rearrangement
'new organisation' is the definition.
(organising another way)
'on scottish isle get to recruit guys' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'scottish isle' becomes 'arran' (island off Scottish coast).
'to recruit' means one lot of letters goes inside another (in the sense of bringing in).
'guys' becomes 'men' (guy can mean a man).
're'+'arran'+'get'='rearranget'
'rearranget' placed around 'men' is 'REARRANGEMENT'.
(Other definitions for rearrangement that I've seen before include "New layout" , "Act of changing layout of items" , "A new ordering" , "Process of moving things around" , "Moving around of component parts" .)