Release clipped hound, barking satisfactorily (6)
I believe the answer is:
unhook
'release' is the definition.
(I've seen this before)
'clipped hound barking satisfactorily' is the wordplay.
'clipped' means to remove the last letter (the word is shortened or clipped).
'barking' indicates anagramming the letters (UK slang for mad).
'satisfactorily' becomes 'O.K.' (synonyms).
'hound' with its last letter taken off is 'houn'.
'houn' is an anagram of 'unho'.
'unho'+'ok'='UNHOOK'
(Other definitions for unhook that I've seen before include "Free" , "Lift off the sharp bent line" , "Release catch" , "Unfasten" , "Detach" .)