Judd's content to go up to green ultimately - or brown? (3)
I believe the answer is:
dun
'brown?' is the definition.
(dun is a kind of brown)
'judd's content to go up to green ultimately' is the wordplay.
'content' says to take the centre.
'to go up' says the letters should be written backwards (I've seen 'goes up' mean this).
'to' is a charade indicator (letters next to each other).
'ultimately' says to take the final letters.
The middle letters of 'judd' are 'ud'.
The last letter of 'green' is 'n'.
'ud' reversed gives 'du'.
'du'+'n'='DUN'
'or' acts as a link.
(Other definitions for dun that I've seen before include "nag, for payment" , "Ask persistently for payment of debt" , "Press for payment" , "Brownish gray" , "Brownish grey horse" .)