Hostess perhaps needs someone present below stairs (6,9)
I believe the answer is:
flight attendant
'hostess perhaps' is the definition.
(hostess is a kind of flight attendant)
'someone present below stairs' is the wordplay.
I cannot really see how this works, but
'someone' could be 'attendant' (attendant is a kind of someone) and 'attendant' is present in the answer.
'stairs' could be 'flight' (flight is a kind of stairs) and 'flight' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'needs' is the link.
Can you help me to learn more?
(Another definition for flight attendant that I've seen is " help on lines".)