Male host, agreeable – to some extent (4)
I believe the answer is:
stag
'male' is the definition.
(a stag is a male deer)
'host agreeable to some extent' is the wordplay.
'to some extent' indicates the answer is hidden within the clue.
'STAG' is hidden in the letters of 'host agreeable'.
(Other definitions for stag that I've seen before include "Male at party?" , "Male animal" , "This party is for men only" , "Horned animal" , "American party" .)