Elderly Russian's bleat about President Kennedy initially (8)
I believe the answer is:
babushka
'elderly russian's' is the definition.
(babushka means a grandmother in Russian)
'bleat about president kennedy initially' is the wordplay.
'bleat' becomes 'baa' (synonyms).
'about' means one lot of letters goes inside another.
'president' becomes 'bush' (George H W Bush or George W Bush).
'initially' indicates taking the first letters.
The initial letter of 'kennedy' is 'k'.
'bush'+'k'='bushk'
'baa' going around 'bushk' is 'BABUSHKA'.
(Other definitions for babushka that I've seen before include "Old woman in Russia" , "Russian granny, her scarf" , "Russian grandmother and her headscarf" , "foreign granny" , "Elderly Russian woman" .)