An old soldier in being discharged is saying goodbye (5-6)

I believe the answer is:

leave-taking

'is saying goodbye' is the definition.
(I've seen this before)

'an old soldier in being discharged' is the wordplay.
'an' becomes 'a'.
'old soldier' becomes 'vet' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'being discharged' becomes 'leaking' (discharge can mean to leak).
'a'+'vet'='avet'
'avet' inserted within 'leaking' is 'LEAVE-TAKING'.

(Another definition for leave-taking that I've seen is " Act of saying goodbye".)

I've seen this clue in The Times.

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