Crossword Genius

Piano piece, both grand and upright, thrashed out (3,5)

Ross

I believe the answer is:

the shard

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

'piano piece both grand and upright' is the definition.
(tall London building designed by Renzo Piano)

'thrashed out' is the wordplay.
I cannot quite see how this works, but
an anagram of 'thrashed' is 'theshard' which is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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