Rare collection, thanks to list of corrections (6)
I believe the answer is:
errata
'list of corrections' is the definition.
(I've seen this in another clue)
'rare collection thanks' is the wordplay.
'collection' is an anagram indicator (the same collection of letters).
'thanks' becomes 'ta' (UK informal version of 'thank you').
'rare' is an anagram of 'erra'.
'erra'+'ta'='ERRATA'
'to' is the link.
(Other definitions for errata that I've seen before include "Corrigenda" , "(Printing) errors" , "List of printed mistakes" , "Mistakes in printed proofs" , "Slips" .)