Awful chatter hindering a vicar doing wedding vows? (8)

'vicar doing wedding vows?' is the definition.
(a vicar 'attaches' a married couple to each other)

'awful chatter hindering a' is the wordplay.
I cannot really understand how this works, but
an anagram of 'chatter' is 'ttacher' which is located in the answer.
'a' is within the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).