Yes, all but head cover goes to make up coarse fellow (5)
I believe the answer is:
yahoo
'coarse fellow' is the definition.
'yahoo' can be an answer for 'fellow' (I have seen 'crude fellow' mean 'yahoo' so perhaps 'fellow' could also mean 'yahoo'). I am not certain of the 'coarse' bit.
'yes all but head cover goes to make up' is the wordplay.
'yes' becomes 'y'.
'all but' means to remove the last letter ('all but' can mean 'almost' or 'nearly').
'head cover' becomes 'hood' (I've seen this before).
'goes to' is a charade indicator (letters next to each other).
'make up' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hood' with its last letter taken off is 'hoo'.
'hoo' put after 'a' is 'ahoo'.
'y'+'ahoo'='YAHOO'
Can you help me to learn more?
(Other definitions for yahoo that I've seen before include "Swift brute" , "Exclamation of joy; brute" , "shout of joy" , "Uncouth person" , "Savage" .)