Again hearing tyre needs replacing in call (8)
I believe the answer is:
retrying
'again hearing' is the definition.
('trying' can be a synonym for 'hearing' so perhaps 'retrying' is OK for 'again hearing')
'tyre needs replacing in call' is the wordplay.
'needs replacing' indicates an anagram (I've seen 'needing replaced' mean this (the letters must be placed elsewhere)).
'in' is an insertion indicator.
'call' becomes 'ring ' (synonyms).
'tyre' anagrammed gives 'etry'.
'etry' going into 'ring' is 'RETRYING'.
(Another definition for retrying that I've seen is " Hearing (a case) again".)