Loudly incontinent and tense European produces complex sound (9)

'complex sound' is the definition.
(type of speech sound)

'loudly incontinent and tense european' is the wordplay.
I cannot quite see how this works, but
'loudly' could be 'ff' (short for fortissimo - 'very loud' in music) and 'ff' is located in the answer.
'tense' could be 't' (abbreviation used in many dictionaries) and 't' is present in the answer.
'european' could be 'e' (abbreviation e.g. EU) and 'e' is present in the answer.
This explanation may well be incorrect...

'produces' acts as a link.