Uncalled-for to take confounded guitars out (10)
I believe the answer is:
gratuitous
'uncalled-for' is the definition.
(synonyms)
'confounded guitars out' is the wordplay.
'confounded' indicates anagramming the letters.
'guitars'+'out'='guitarsout'
'guitarsout' anagrammed gives 'GRATUITOUS'.
'to take' acts as a link.
(Other definitions for gratuitous that I've seen before include "uncalled for" , "Needless" , "Done without good reason; free" , "without justification" .)