That male sheep is angry (3,2)
I believe the answer is:
het up
'angry' is the definition.
(similar in meaning)
'that male sheep' is the wordplay.
'that male' becomes 'he' (he refers to a man).
'sheep' becomes 'tup' (tup is a kind of sheep).
'he'+'tup'='HET UP'
'is' is the link.
(Other definitions for het up that I've seen before include "Upset, agitated" , "On edge - agitated" , "Angry - agitated" , "in a rage?" , "Irate" .)