Andy Burnham is cross about a Liberal raising stock (6,9)

I believe the answer is:

animal husbandry

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'raising stock' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'andy burnham is cross about a liberal' is the wordplay.
'cross' is an anagram indicator (a cross or irritated version of the letters).
'about' is an insertion indicator.
'liberal' becomes 'l' (abbreviation).
'andy'+'burnham'+'is'='andyburnhamis'
'andyburnhamis' anagrammed gives 'animhusbandry'.
'a'+'l'='al'
'animhusbandry' enclosing 'al' is 'ANIMAL HUSBANDRY'.

Can you help me to learn more?

(Another definition for animal husbandry that I've seen is " Farming".)

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