Capital I would secure to invest in coffee (10)

I believe the answer is:

bridgetown

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

'i would secure to invest in coffee' is the wordplay.
'i would' becomes 'I'd'.
'secure' becomes 'get'.
'to invest in' means one lot of letters goes inside another.
'coffee' becomes 'brown' (I can't justify this - if you can you should believe this answer much more).
'id'+'get'='idget'
'idget' placed inside 'brown' is 'BRIDGETOWN'.

Can you help me to learn more?

(Other definitions for bridgetown that I've seen before include "in Caribbean" , "capital" .)

I've seen this clue in The Guardian.

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