Crossword Genius

Flagship boarded by king (8)

Ross

I believe the answer is:

streamer

I'm a little stuck... Click here to teach me more about this clue!

'flagship' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'boarded by king' is the wordplay.
I cannot quite understand how this works, but
'king' could be 'er' (abbreviation for Edward Rex, various English kings) and 'er' is found in the answer.
The remaining letters 'stream' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for streamer that I've seen before include "that hangs about now?" , "Ribbon for throwing" , "Heavy cold" , "Bit of bunting" , "awful cold?" .)

I've seen this clue in The Guardian.
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