Confine false allies holding company back (8)
I believe the answer is:
localise
'confine' is the definition.
('confine'->'localize' is in my internal thesaurus and 'ize'->'ise')
'false allies holding company back' is the wordplay.
'false' is an anagram indicator.
'holding' is an insertion indicator.
'company' becomes 'co' (abbreviation).
'back' shows that the letters should be reversed in order.
'co' back-to-front is 'oc'.
'allies' with letters rearranged gives 'lalise'.
'lalise' going around 'oc' is 'LOCALISE'.
(Other definitions for localise that I've seen before include "Restrict to the immediate area" , "Confine" .)