Agreed to go north without new angora jumper (8)
'jumper' is the definition.
(I've seen this before)
'agreed to go north without new angora' is the wordplay.
'agreed' becomes 'ok' (e.g. when responding to offer).
'to go north' shows that the letters should be reversed in order (I've seen 'going north' mean this).
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'new' indicates anagramming the letters.
'ok' written backwards gives 'ko'.
'angora' with letters rearranged gives 'angaro'.
'ko' placed around 'angaro' is 'KANGAROO'.
(Other definitions for kangaroo that I've seen before include "Pouched mammal", "Unofficial court of law", "Aussie boxer", "Large Australian mammel", "One bounces".)