Wary about overturning support for container of dangerous liquid (6)

I believe the answer is:

carboy

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'container of dangerous liquid' is the definition.
'carboy' can be an answer for 'container' (carboy is a kind of container). I am not sure about the 'of dangerous liquid' bit.

'wary about overturning support' is the wordplay.
'wary' becomes 'coy' (I can't explain this - if you can you should believe this answer much more).
'about' is an insertion indicator.
'overturning' is a reversal indicator.
'support' becomes 'bra' (a support for the breasts).
'bra' written backwards gives 'arb'.
'coy' enclosing 'arb' is 'CARBOY'.

'for' is the link.

Can you help me to learn more?

(Other definitions for carboy that I've seen before include "Large bottle to contain chemicals - boa cry (anag)" , "Large cushioned container for liquids" , "Large bottle for acids" , "Large round bottle with protective framework" , "Large bottle for corrosive liquid" .)

I've seen this clue in The Guardian.

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