Toxic chemical found in gammon I ate (7)

I believe the answer is:

ammonia

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

'toxic chemical' is the definition.
'ammonia' can be an answer for 'chemical' (I have seen 'pungent chemical' mean 'ammonia' so perhaps 'chemical' could also mean 'ammonia'). I'm unsure of the 'toxic' bit.

'in gammon i ate' is the wordplay.
'in' indicates the answer is hidden within the clue.
'AMMONIA' is hidden in the letters of 'gammon i ate'.

'found' acts as a link.

Can you help me to learn more?

(Other definitions for ammonia that I've seen before include "Pungent cleaner" , "Pungent gas, NH3" , "Gas; cleaning fluid" , "Pungent gas formed of nitrogen and hydrogen" , "Nitrogen-hydrogen gas" .)

I've seen this clue in The Telegraph.

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