Crossword Genius

Make blue colour hems in Gerald's jacket (5,4)

Ross

I believe the answer is:

bring down

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

'make blue' is the definition.
(to bring someone down is to make them blue)

'colour hems in gerald's jacket' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bring down that I've seen before include "make trip" , "floor" , "Overthrow; humble" , "shoot" .)

I've seen this clue in The Guardian.
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