Crossword Genius

Back in first part of post-lunch period (3)

Ross

I believe the answer is:

aft

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'back' is the definition.
(associated in meaning)

'first part of post-lunch period' is the wordplay.
'first' becomes 'a' (first letter of the alphabet).
'part of post lunch period' becomes 'ft' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'ft'='AFT'

'in' is the link.

Can you help me to learn more?

(Other definitions for aft that I've seen before include "near the tail" , "Toward's a ship's stern" , "At the back at sea" , "behind boat" , "Towards the rear at sea" .)

I've seen this clue in The Times.
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