Tough guy who can get mean when you knock his block off! (2-3)
I believe the answer is:
he-man
'tough guy' is the definition.
(I've seen this before)
'get mean when you knock his block off' is the wordplay.
I cannot really understand how this works, but
an anagram of 'mean' is 'eman' which is within the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'who can' acts as a link.
Can you help me to learn more?
(Other definitions for he-man that I've seen before include "Alpha male" , "Muscular fellow" , "Masterful male, macho sort" , "Tough guy, doubly male" , "Macho chap" .)