He’s a short head in front! (3)
I believe the answer is:
son
'he's' is the definition.
'a short head in front' is the wordplay.
'head' says to take the initial letters.
'in front' becomes 'on' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'short' is 's'.
's'+'on'='SON'
Can you help me to learn more?
(Other definitions for son that I've seen before include "Male descendant" , "Heir" , "Male child" , "Native" , "Male offspring" .)