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Regularly fart a very long time, producing unpleasant gas (5)

Ross

I believe the answer is:

freon

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

'gas' is the definition.
(I know that Freon is a type of CFC)

'regularly fart a very long time' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'a very long time' becomes 'eon' (an extremely long period of time).
The alternate letters of 'fart' are 'fr'.
'fr'+'eon'='FREON'

'producing unpleasant' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Independent.
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