Animal that grazes in pen put up on island (5)
I believe the answer is:
oribi
'animal that grazes' is the definition.
'oribi' can be an answer for 'animal' (type of antelope). I'm unsure of the remainder of the definition.
'pen put up on island' is the wordplay.
'pen' becomes 'Biro' (Biro is a make of pen).
'put up' says the letters should be written backwards.
'on' is a charade indicator (letters next to each other).
'island' becomes 'i' (geographical abbreviation).
'biro' reversed gives 'orib'.
'orib'+'i'='ORIBI'
'in' is the link.
Can you help me to learn more?
(Other definitions for oribi that I've seen before include "small hoofed beast" , "Graceful runner" , "resident of Savannah" , "One grazing" , "Beastly sort" .)