Second-class farm is growing maybe (6)

I believe the answer is:

branch

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'is growing maybe' is the definition.
I can't tell whether this definition defines the answer.

'second-class farm' is the wordplay.
'second class' becomes 'b'.
'farm' becomes 'ranch' (ranch is a kind of farm).
'b'+'ranch'='BRANCH'

Can you help me to learn more?

(Other definitions for branch that I've seen before include "Part of organisation or tree" , "Fork of a main stem" , "Division of a stem" , "Offshoot, subsidiary part" , "'Fork, offshoot (6)'" .)

I've seen this clue in The Globe and Mail.

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