Slam chicken or turkey in oven? (5)

I believe the answer is:

roast

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'slam chicken' is the definition.
'roast' can be an answer for 'slam' (both can mean to heavily criticise). I am not certain of the 'chicken' bit.

'turkey in oven?' is the wordplay.
'turkey in' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'oven?' becomes 'oast' (type of kiln).
'r'+'oast'='ROAST'

'or' is the link.

Can you help me to learn more?

(Other definitions for roast that I've seen before include "open-air party in US" , "Traditional Sunday joint?" , "Heavily criticise" , "Cook (meat) over a fire" , "Slate" .)

I've seen this clue in The Telegraph.

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