Will he also clean the master's car? (5)
I believe the answer is:
valet
'car?' is the definition.
(I have seen 'Clean car' mean 'valet' so perhaps 'car' could also mean 'valet')
'will he also clean the master's' is the wordplay.
I cannot really understand how this works, but
'he' could be 'vale' and 'vale' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for valet that I've seen before include "Man's personal attendant" , "Man's servant" , "Gentleman's gentleman" , "Jeeves?" , "Gentleman's assistant" .)