Does he re-style his hair a lot? (5)
I believe the answer is:
hiram
'does he re-style his' is the definition.
The definition suggests a singular noun which matches the answer.
'hair a lot?' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'hair' is 'hira' which is located in the answer.
'lot?' could be 'm' and 'm' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hiram that I've seen before include "He supplied temple builders" , "I gave Solomon materials for Temple" .)