Hide air-bed that's been delivered (3,3)
I believe the answer is:
lie low
'hide' is the definition.
(lying low is a kind of hiding)
'air-bed that's been delivered' is the wordplay.
I cannot really understand how this works, but
'that's' could be 'ie' (abbreviation for 'id est', 'that is' in Latin) and 'ie' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lie low that I've seen before include "don't show your face" , "Conceal oneself in recumbent posture?" , "Absent oneself from social contact (for a period)" , "Go to ground" , "Use bottom bunk, perhaps" .)