One married friend has a graceful animal (6)

I believe the answer is:

impala

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

'graceful animal' is the definition.
'impala' can be an answer for 'animal' (I've seen this before). I am unsure of the 'graceful' bit.

'one married friend has a' is the wordplay.
'one' becomes 'i' (Roman numeral).
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'friend' becomes 'pal' (pal can mean a friend).
'has' means one lot of letters go next to another.
'i'+'m'+'pal'+'a'='IMPALA'

Can you help me to learn more?

(Other definitions for impala that I've seen before include "One regularly browsing" , "horned beast" , "Big game" , "Species of African antelope" , "graceful African runner" .)

I've seen this clue in The Mirror.

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