Crossword Genius

Is a cloth cap any different when greenish blue? (4)

Ross

I believe the answer is:

cyan

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

'greenish blue?' is the definition.
(I've seen this before)

'is a cloth cap any different' is the wordplay.
'is a cloth cap' becomes 'c' (I can't explain this - if you can you should give a lot more credence to this answer).
'different' is an anagram indicator (letters placed in a different order).
'any' is an anagram of 'yan'.
'c'+'yan'='CYAN'

'when' is the link.

Can you help me to learn more?

(Other definitions for cyan that I've seen before include "Blue printing ink" , "shade of blue" , "Printer's blue" , "Bluish green" , "Blue-green colour" .)

I've seen this clue in the Evening Standard.
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