Crossword Genius

Most boring Washington DC airport, plus its terminal? (7)

Ross

I believe the answer is:

dullest

'most boring' is the definition.
('dull' can be similar in meaning to 'boring')

'washington dc airport plus its terminal?' is the wordplay.
I cannot quite understand how this works, but
'airport' could be 'dulles' (Dulles International Airport in Washington DC) and 'dulles' is found within the answer.
A single letter 't' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

(Other definitions for dullest that I've seen before include "Most tedious" , "that's not at all interesting" , "Least shiny" , "Least interesting" , "Most unintelligent" .)

I've seen this clue in The Guardian.
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