Fit out (5)
'fit out' is the definition.
(I know that fit out can be written as equip)
This is all the clue.
(Other definitions for equip that I've seen before include "Provide with items (for particular task)" , "Provide with requirements" , "Furnish with requirements" , "Outfit" , "Fit out, supply" .)
'fit out' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for arm that I've seen before include "Part of chair" , "inlet" , "Test of strength with elbows on the table" , "Equip with weapon" , "Supply weapons" .)