In the Humber this mooring may be found (5)
I believe the answer is:
berth
'in the humber this mooring may be found' is the definition.
'berth' can be an answer for 'mooring' (synonyms). I am not certain of the rest of the definition.
'in the humber this mooring' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BERTH' can be found hidden inside 'humber this mooring'.
Can you help me to learn more?
(Other definitions for berth that I've seen before include "Bed; mooring" , "Bed in ship or train" , "Room on a ship" , "Bunk; mooring place" , "Place to lie down on train or ship" .)