Fully cleared after sounding angry, swear (7)
I believe the answer is:
testify
'swear' is the definition.
(thesaurus)
'fully cleared after sounding' is the wordplay.
'cleared' says to hollow out the word (remove centre letters) (the inside letters are cleared out).
'after' says to put letters next to each other.
'sounding' becomes 'testi' (I am not sure about this - if you are sure you should believe this answer much more).
'fully' with its middle taken out is 'fy'.
'fy' after 'testi' is 'TESTIFY'.
'angry' acts as a link.
This may not be correct. It may belong to another bit of the clue.
(Other definitions for testify that I've seen before include "take the stand" , "Bear witness in court" , "Give evidence in court" , "Affirm (on oath)" , "sworn" .)