Heard first appearance of bed (5)
I believe the answer is:
berth
'appearance of bed' is the definition.
'berth' can be an answer for 'bed' (berth is a kind of bed). I'm not certain of the 'appearance of' bit.
'heard first' is the wordplay.
'heard' shows a homophone (sound like).
'first' becomes 'birth' (birth is a kind of first).
'birth' is a homophone of 'BERTH'.
Can you help me to learn more?
(Other definitions for berth that I've seen before include "Place aboard" , "Accommodation on a ship" , "Bed on a ship/train" , "Ship's bunk" , "Place to lie down on train or ship" .)