Heard seer managed to get trained (9)

I believe the answer is:

rehearsed

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'trained' is the definition.
Although both the answer and definition are past participle verbs, I don't see how one could define the other.

'heard seer managed' is the wordplay.
'managed' indicates anagramming the letters.
'heard'+'seer'='heardseer'
'heardseer' is an anagram of 'REHEARSED'.

'to get' acts as a link.

Can you help me to learn more?

(Other definitions for rehearsed that I've seen before include "Practiced (a play)" , "Practised for public performance" , "went over" , "Front-rear axle distance" .)

I've seen this clue in The Mirror.

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