Settle dues, to get accustomed (4,2)
I believe the answer is:
used to
'accustomed' is the definition.
(similar in meaning)
'settle dues to' is the wordplay.
'settle' is an anagram indicator (I've seen 'settled' mean this).
'dues' anagrammed gives 'used'.
'used'+'to'='USED TO'
'get' is the link.
(Other definitions for used to that I've seen before include "Familiar with" , "Was in the habit" , "Not unfamiliar with" , "Accustomed or inured" , "Did at times in the past" .)