Fragrant flower subdues impertinence (7)

I believe the answer is:

cowslip

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'fragrant flower' is the definition.
'cowslip' can be an answer for 'flower' (I've seen this before). I am not certain of the 'fragrant' bit.

'subdues impertinence' is the wordplay.
'subdues' becomes 'cows' (I can't explain this - if you can you should believe this answer much more).
'impertinence' becomes 'lip' (lip is a kind of impertinence).
'cows'+'lip'='COWSLIP'

Can you help me to learn more?

(Other definitions for cowslip that I've seen before include "Fictional rabbit" , "bloomers cover this" , "Flowering plant" , "Wild yellow primula" , "bloomer" .)

I've seen this clue in The Telegraph.

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