Bold, connecting underwear to philosophy (6)

I believe the answer is:

brazen

I'm a little stuck... Click here to teach me more about this clue!

'bold' is the definition.
(I've seen this before)

'connecting underwear to philosophy' is the wordplay.
'connecting underwear' becomes 'bra' (bra is a type of undergarment. I am not sure about the 'connecting' bit.).
'to philosophy' becomes 'zen'.
'bra'+'zen'='BRAZEN'

Can you help me to learn more?

(Other definitions for brazen that I've seen before include "Insolent, barefaced" , "Brassy and impudent." , "Forward" , "Bold-faced" , "Shameless and bold - resembling brass" .)

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app