Crossword Genius

Show-off that's more 'sophisticated' rejecting last bit of sandwich (5)

Ross

I believe the answer is:

poser

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

'show-off' is the definition.
(poser is a kind of show-off)

'more sophisticated rejecting last bit of sandwich' is the wordplay.
'POSER' is hidden backwards in amongst the letters.
However, I'm not sure how this is indicated.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for poser that I've seen before include "insincere?" , "Brain-teaser" , "Question - a sitter" , "Exhibitionist" , "What's difficult" .)

I've seen this clue in The Independent.
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