Can staff identify with someone so heartless? (6)

I believe the answer is:

tinman

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'with someone so heartless?' is the definition.
I can't tell whether this defines the answer.

'can staff' is the wordplay.
'can' becomes 'tin' (both are metal containers).
'staff' becomes 'man' (as in staffing or manning a particular place).
'tin'+'man'='TINMAN'

'identify' is the link.

Can you help me to learn more?

(Other definitions for tinman that I've seen before include "Worker in a silvery-white metal" , "Metallic friend of Dorothy's in The Wizard of Oz" , "He seeks for a heart in Oz" , "metalworker?" , "heartless character" .)

I've seen this clue in The Irish Times.

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