Frank given to be so generous (4-6)

I believe the answer is:

open-handed

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'so generous' is the definition.
'open handed' can be an answer for 'generous' (I've seen this before). I am not sure about the 'so' bit.

'frank given' is the wordplay.
'frank' becomes 'open' (synonyms).
'given' becomes 'handed' ('hand' can be a synonym of 'give').
'open'+'handed'='OPEN-HANDED'

'to be' is the link.

Can you help me to learn more?

(Other definitions for open-handed that I've seen before include "Big-hearted?" , "Generous" .)

I've seen this clue in the Sydney Morning Herald.

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