Talk of having nothing to share (7)

I believe the answer is:

oration

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'talk of' is the definition.
'oration' can be an answer for 'talk' (an oration is a speech). I'm not certain of the 'of' bit.

'nothing to share' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to share' becomes 'ration' (a ration is a share of a limited resource).
'o'+'ration'='ORATION'

'having' acts as a link.

Can you help me to learn more?

(Other definitions for oration that I've seen before include "Making a speech" , "Type 16 [OF SPEECH]" , "words" , "Platform speech" , "A formal or public speech" .)

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

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