Turn strong women's organisation into group which bloviates (3,2,4)
I believe the answer is:
bag of wind
'which bloviates' is the definition.
(someone who waffles or bloviates)
'turn strong women's organisation into group' is the wordplay.
'turn' becomes 'go' (a person's move in a board game).
'strong' becomes 'f' (musical symbol for 'forte', 'strong' in Italian).
'women's organisation' becomes 'wi' (abbreviation for Women's Institute).
'into' means one lot of letters goes inside another.
'group' becomes 'band' (band can mean a group of people).
'go'+'f'+'wi'='gofwi'
'gofwi' going inside 'band' is 'BAG OF WIND'.
(Another definition for bag of wind that I've seen is " Voluble, boring person".)