Say Gatwick Express reaches harbour (7)
I believe the answer is:
airport
'say' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'gatwick express reaches harbour' is the wordplay.
I cannot quite see how this works, but
'express' could be 'air' (I've seen this in another clue) and 'air' is found within the answer.
'harbour' could be 'port' (I've seen this before) and 'port' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for airport that I've seen before include "Place for comings and goings -- or a trip (anag)" , "Aviation centre" , "Liverpool's John Lennon, for example" , "where flight begins or ends" , "landing here?" .)