Crossword Genius

Unreliable supporter of hushaby baby (5)

Ross

I believe the answer is:

bough

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

This could be a double definition.

'unreliable supporter' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'hushaby baby' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'of' is the link.

Can you help me to learn more?

(Other definitions for bough that I've seen before include "Main branch (of tree)" , "Substantial branch of a tree" .)

I've seen this clue in the Evening Standard.
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