Horny creature, one primarily beguiling former partner (4)
I believe the answer is:
ibex
'horny creature' is the definition.
'ibex' can be an answer for 'creature' (I've seen this before). I'm unsure of the 'horny' bit.
'one primarily beguiling former partner' is the wordplay.
'one' becomes 'i' (Roman numeral).
'primarily' suggests taking the first letters.
'former partner' becomes 'ex' (an ex-partner).
The first letter of 'beguiling' is 'b'.
'i'+'b'+'ex'='IBEX'
Can you help me to learn more?
(Other definitions for ibex that I've seen before include "Wild goat with double curved horns" , "Wild goat with large recurved horns" , "one seldom puts a foot wrong" , "Wild mountain goat" , "Mountain goat with long curved horns" .)