Glad plane is reaching time for arrival (5,5)
I believe the answer is:
happy event
'arrival' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'glad plane is reaching time' is the wordplay.
'glad' becomes 'happy' ('happy' can be a synonym of 'glad').
'plane' becomes 'even' ('even' can be similar in meaning to 'plane').
'is reaching' is a charade indicator (letters next to each other).
'time' becomes 't'.
'happy'+'even'+'t'='HAPPY EVENT'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for happy event that I've seen before include "Successful delivery" , "Ma's joy" , "Birth of a child" .)