Send a piece of fencing (4)

I believe the answer is:

post

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'send' is the definition.
(to send in the post)

'a piece of fencing' is the wordplay.
'a piece' becomes 'p' (abbreviation for Pawn).
'of fencing' becomes 'ost' (I am not sure about this - if you are sure you should believe this answer much more).
'p'+'ost'='POST'

Can you help me to learn more?

(Other definitions for post that I've seen before include "Pole - position" , "Appointment (with the Royal Mail?)" , "(Holiday) communication" , "Station" , "delivery" .)

I've seen this clue in the Evening Standard.

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