Carpet man loses heart, having messy hair (6)
I believe the answer is:
shaggy
'having messy hair' is the definition.
I can't judge whether this defines the answer.
'carpet man loses heart' is the wordplay.
'carpet' becomes 'shag' (I can't justify this - if you can you should believe this answer much more).
'man' becomes 'guy' (guy is a kind of man).
'loses heart' means to remove the middle letters.
'guy' with its middle taken out is 'gy'.
'shag'+'gy'='SHAGGY'
Can you help me to learn more?
(Other definitions for shaggy that I've seen before include "Ill-kempt" , "Hairy and unkempt" , "(Of fur) long and unkempt" , "With long coarse hair" , "Kind of story about a dog?" .)