Add space for tribal symbol (5)
I believe the answer is:
totem
'tribal symbol' is the definition.
(I've seen this before)
'add space' is the wordplay.
'add' becomes 'tot' ('tot' can be a synonym of 'add').
'space' becomes 'em' (in typography, a space as wide as a letter 'm').
'tot'+'em'='TOTEM'
'for' acts as a link.
(Other definitions for totem that I've seen before include "Revered object" , "(Tribal) emblem" , "Sort of pole" , "Animal as emblem" , "Object of veneration" .)