With grounds for having ended a journey by air (6)
I believe the answer is:
landed
'with grounds' is the definition.
(I've seen this before)
'having ended a journey by air' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for landed that I've seen before include "With grounds" , "Came down to earth" , "Alighted" , "having ended the journey by air" , "Disembarked - owning estates" .)