Crossword Genius

Stone or piece of broken glass possibly hard to remove (4)

Ross

I believe the answer is:

sard

'stone' is the definition.
(thesaurus)

'piece of broken glass possibly hard to remove' is the wordplay.
'piece of broken glass possibly' becomes 'shard'.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'to remove' is a deletion indicator.
'shard' with 'h' taken out is 'SARD'.

'or' is the link.

(Another definition for sard that I've seen is " Variety of chalcedony".)

I've seen this clue in The Telegraph.
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