Be featured in short commercial lying down? (4)
I believe the answer is:
abed
'lying down?' is the definition.
(I've seen this before)
'be featured in short commercial' is the wordplay.
'featured in' indicates putting letters inside.
'short commercial' becomes 'ad'.
'be' inserted within 'ad' is 'ABED'.
(Other definitions for abed that I've seen before include "Possibly sleeping" , "Not yet risen" , "how we all hope to go?" , "going to sleep?" , "in a comfortable position" .)