A broken tile, certain to be free (2,7)
I believe the answer is:
at leisure
'be free' is the definition.
(I've seen this in another clue)
'a broken tile certain' is the wordplay.
'broken' is an anagram indicator.
'certain' becomes 'sure' (synonyms).
'tile' is an anagram of 'tlei'.
'a'+'tlei'+'sure'='AT LEISURE'
'to' is the link.
(Other definitions for at leisure that I've seen before include "resting" , "With time to spare" , "See ritual while taking it easy" , "free" , "No hurry, having a rest" .)