Left by a large wormhole? (6)
I believe the answer is:
portal
'wormhole?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'left by a large' is the wordplay.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'by' is a charade indicator (letters next to each other).
'large' becomes 'L' (eg in clothes sizes).
'port'+'a'+'l'='PORTAL'
Can you help me to learn more?
(Other definitions for portal that I've seen before include "Grand sort of entrance." , "An imposing gateway" , "Grand and imposing entrance" , "Gate, entrance" , "Special website bringing together information from diverse sources in a uniform way" .)