Study dance, a former Stock Exchange procedure (8)

I believe the answer is:

contango

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'a former stock exchange procedure' is the definition.
The definition suggests a singular noun which matches the answer.

'study dance' is the wordplay.
'study' becomes 'con' (con can mean to study).
'dance' becomes 'tango' (tango is a type of dance).
'con'+'tango'='CONTANGO'

Can you help me to learn more?

(Other definitions for contango that I've seen before include "fee for postponement" , "Postponement of payment" .)

I've seen this clue in The Times.

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