Check restraining macho types getting heated (8)
I believe the answer is:
vehement
'heated' is the definition.
(I've seen this before)
'check restraining macho types' is the wordplay.
'check' becomes 'vet' (I've seen this before).
'restraining' is an insertion indicator.
'macho types' becomes 'hemen'.
'vet' going around 'hemen' is 'VEHEMENT'.
'getting' is the link.
(Other definitions for vehement that I've seen before include "Energetic" , "Vigorous, emphatic" , "Showing strong feeling, intense in speech" , "Vet he-men showing strong feeling" , "Even them being intense, showing strong feeling" .)