Allude to the right to get free, possibly (5)
I believe the answer is:
refer
'allude' is the definition.
(I've seen this in another clue)
'the right to get free possibly' is the wordplay.
'the right' becomes 'r' (common abbreviation).
'to get' says to put letters next to each other.
'possibly' indicates an anagram.
'free' with letters rearranged gives 'efer'.
'r'+'efer'='REFER'
'to' acts as a link.
(Other definitions for refer that I've seen before include "Make an allusion, or send on" , "Allude, assign" , "Pass" , "If special treatment needed, GP might do this" , "Be relevant (to)" .)