Crossword Genius

Fee provided by petty officer at part of journey (7)

Ross

I believe the answer is:

postage

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'fee' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'petty officer at part of journey' is the wordplay.
'petty officer' becomes 'po' (naval abbreviation).
'at' is a charade indicator (letters next to each other).
'part of journey' becomes 'stage' ('stage' is part of 'journey').
'po'+'stage'='POSTAGE'

'provided by' is the link.

Can you help me to learn more?

(Other definitions for postage that I've seen before include "Cost to send a mail item", "Amount paid to mail", "Charge for 23 Acrosses", "Cost of corresponding", "Money charged for delivery".)

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