Engineer finds test site to address complicated design (9)

I believe the answer is:

elaborate

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

'complicated design' is the definition.
'elaborate' can be an answer for 'complicated' (thesaurus). I am unsure of the 'design' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for elaborate that I've seen before include "Complicate" , "Fussy" , "Polish" , "Present in further detail" , "Complicated or fancy" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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