Crossword Genius

Jet surpasses birds (9)

Ross

I believe the answer is:

blackcaps

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

'birds' is the definition.
(blackcap is a kind of bird)

'jet surpasses' is the wordplay.
'jet' becomes 'black' (similar in meaning).
'surpasses' becomes 'caps' (I can't justify this - if you can you should give a lot more credence to this answer).
'black'+'caps'='BLACKCAPS'

Can you help me to learn more?

(Other definitions for blackcaps that I've seen before include "they have beaks" , "Judges used to have them" .)

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