End up ferrying son places (5)

I believe the answer is:

posts

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'places' is the definition.
(post is a kind of place)

'end up ferrying son' is the wordplay.
'end' suggests the final letters.
'ferrying' becomes 'ost' (I can't justify this - if you can you should give a lot more credence to this answer).
'son' becomes 's'.
The final letter of 'up' is 'p'.
'p'+'ost'+'s'='POSTS'

Can you help me to learn more?

(Other definitions for posts that I've seen before include "Mails the uprights?" , "Jobs and poles" , "Stakes" , "Is dispatching" , "a couple seen propping up the bar?" .)

I've seen this clue in The Telegraph.

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