Groups of soldiers from Tunis, perhaps (5)
I believe the answer is:
units
'groups of soldiers' is the definition.
(I've seen this in another clue)
'tunis perhaps' is the wordplay.
'perhaps' indicates an anagram.
'tunis' is an anagram of 'UNITS'.
'from' acts as a link.
(Other definitions for units that I've seen before include "Single undivided wholes" , "Individual things as parts of a whole" , "Measures of alcohol" , "Apparatus similar to barbecue" , "military teams" .)