Crossword Genius

Invest in merger of Chelmsford and Aintree? (6)

Ross

I believe the answer is:

ordain

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

'invest' is the definition.
(I know that ordain is a kind of invest)

'in merger of chelmsford and aintree?' is the wordplay.
I cannot really understand how this works, but
'in' is within the answer.
'of' could be 'o' and 'o' is found in the answer.
The remaining letters 'rda' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ordain that I've seen before include "Inroad (anag.)" , "Appoint as priest" , "Establish" , "Destine" , "Install as priest" .)

I've seen this clue in The Times.
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