Al Shearer’s injured in practice sessions (10)

I believe the answer is:

rehearsals

'practice sessions' is the definition.
(rehearsal is a kind of practice session)

'al shearer's injured in' is the wordplay.
'injured' is an anagram indicator.
'in' is an insertion indicator.
'shearers' anagrammed gives 'rehearss'.
'al' going into 'rehearss' is 'REHEARSALS'.

(Another definition for rehearsals that I've seen is " Practice sessions".)

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