Crossword Genius

Racehorse that finishes up after all the others (6)

Ross

I believe the answer is:

plater

I'm a little stuck... Click here to teach me more about this clue!

'racehorse that finishes up' is the definition.
The definition suggests a singular noun which matches the answer.

'after all the others' is the wordplay.
I cannot really understand how this works, but
'after' could be 'later' (I've seen this before) and 'later' is located in the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for plater that I've seen before include "Worker who coats articles with a film of metal" , "cook?" , "Alan, playwright" , "horse entered in minor race" .)

I've seen this clue in the Evening Standard.
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