Rear of shabby window-shade showing a big gap (7)
I believe the answer is:
yawning
'showing a big gap' is the definition.
Although both the answer and definition are present participle verbs, I can't understand how one could define the other.
'rear of shabby window-shade' is the wordplay.
'rear of' says to take the final letters.
'window shade' becomes 'awning' (I've seen this in another clue).
The final letter of 'shabby' is 'y'.
'y'+'awning'='YAWNING'
Can you help me to learn more?
(Other definitions for yawning that I've seen before include "Gaping wide open" , "showing sign of fatigue?" , "Wide open (as chasm)" , "Bored" , "Showing boredom?" .)