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' indicates an anagram.
'in' is an insertion indicator.
'shearers' anagrammed gives 'rehearss'.
'al' placed inside 'rehearss' is 'REHEARSALS'.

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

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