Giving birth on the farm? — not being serious! (7)

I believe the answer is:

kidding

'giving birth on the farm?' is the definition.
(kidding is giving birth to goats)

'being serious' is the wordplay.
'being' becomes 'kid' (kid is a kind of being).
'serious' becomes 'ding' (I am not sure about this - if you are sure you should believe this answer much more).
'kid'+'ding'='KIDDING'

'not' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

(Another definition for kidding that I've seen is " Pulling someone's leg".)

I've seen this clue in The Times.

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