Crossword Genius

Capacity of crew seeing across delta (9)

Ross

I believe the answer is:

bandwidth

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

'capacity' is the definition.
(I've seen this before)

'crew seeing across delta' is the wordplay.
'crew' becomes 'band' (both can mean a group of people).
'seeing across delta' becomes 'width' (I can't justify this - if you can you should give a lot more credence to this answer).
'band'+'width'='BANDWIDTH'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for bandwidth that I've seen before include "Particular range of frequencies" , "Informal capacity" , "Range of transmission frequencies" .)

I've seen this clue in The Sunday Times.
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