Irregular employment of injured picadors (8)

I believe the answer is:

sporadic

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'irregular' is the definition.
(similar in meaning)

'employment of injured picadors' is the wordplay.
'picadors' can be anagrammed to 'SPORADIC'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sporadic that I've seen before include "Occurring irregularly" , "Scattered - irregular" , "Fitful, intermittent" , "Occurring here and there, like picadors" , "Occasional - intermittent" .)

I've seen this clue in The Irish Independent.

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