Stay after farewell call (4,4)

I believe the answer is:

last post

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'farewell call' is the definition.
'last post' can be an answer for 'call' (I've seen this before). I'm not certain of the 'farewell' bit.

'stay after' is the wordplay.
'stay' becomes 'last'.
'after' becomes 'post' (suffix meaning after, eg post-war).
'last'+'post'='LAST POST'

Can you help me to learn more?

(Other definitions for last post that I've seen before include "It's played at bedtime in the army" , "Farewell bugle call" , "final delivery" , "Evening collection" , "Army bugle call at sunset and funerals" .)

I've seen this clue in The Telegraph.

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