If your car's dirty, is he your man? (5)
I believe the answer is:
valet
'man?' is the definition.
('valet' can be a synonym of 'man')
'if your car's dirty is he your' is the wordplay.
I cannot quite see how this works, but
'he' could be 'vale' and 'vale' is found in the answer.
'car' could be 't' and 't' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for valet that I've seen before include "Male servant" , "Personal male assistant" , "Gentleman's gentleman" , "Man's personal attendant" , "Batman" .)