Crossword Genius

One — and he spends freely — showing this? (4-10)

Ross

I believe the answer is:

open-handedness

'this?' is the definition.
The definition suggests a singular noun which matches the answer.

'one and he spends freely' is the wordplay.
'freely' is an anagram indicator.
'one'+'and'+'he'+'spends'='oneandhespends'
'oneandhespends' anagrammed gives 'OPEN-HANDEDNESS'.

'showing' acts as a link.

(Another definition for open-handedness that I've seen is " Generosity".)

I've seen this clue in The Times.
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