Kiera extremely fond, to begin with, of light brown, flowing garment (6)
I believe the answer is:
kaftan
'flowing garment' is the definition.
'kaftan' can be an answer for 'garment' (kaftan is a kind of garment). I am not sure about the 'flowing' bit.
'kiera extremely fond to begin with of light brown' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'to begin with of' indicates taking the first letters (I've seen 'begin with' mean this).
'light brown' becomes 'tan' (tan is a light brown colour).
'kiera' with its centre removed is 'ka'.
The first letter of 'fond' is 'f'.
'ka'+'f'+'tan'='KAFTAN'
Can you help me to learn more?
(Other definitions for kaftan that I've seen before include "Loose garment" , "Long belted tunic; loose dress" , "Eastern garment" , "Long loose coat, dress" , "Long cloak with full sleeves" .)