Develop complex (9)

I believe the answer is:

elaborate

I believe this clue is a double definition.

'develop' is the first definition.
(elaborating is a kind of developing)

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

(Other definitions for elaborate that I've seen before include "Complicate" , "Complicated or ornate" , "Present in further detail" , "flesh out?" , "Complicated - work out" .)

I've seen this clue in The Times, The Telegraph, The Independent, The Guardian and The Sun.

Want a hint initially instead of a full solution? Install my app