You heard old lady picked up Finnish without opposition? (9)
I believe the answer is:
unanimous
'without opposition?' is the definition.
I can't judge whether this defines the answer.
'you heard old lady picked up finnish' is the wordplay.
'you heard' becomes 'U' (homophone of 'you').
'old lady' becomes 'nan' (British slang for grandmother).
'picked up' says the letters should be written backwards.
'finnish' becomes 'Suomi' (synonyms).
'suomi' reversed gives 'imous'.
'u'+'nan'+'imous'='UNANIMOUS'
Can you help me to learn more?
(Other definitions for unanimous that I've seen before include "Without one dissenter" , "Concerted" , "With one mind" , "Acting together" , "no-one disagreeing" .)