Most of line teacher prepared is free from trouble (2,3,5)

I believe the answer is:

in the clear

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'free from trouble' is the definition.
'in the clear' can be an answer for 'free' (thesaurus). I'm not certain of the 'from trouble' bit.

'most of line teacher prepared' is the wordplay.
'most of' means to remove the last letter.
'prepared' indicates an anagram.
'line' with its final letter taken off is 'lin'.
'lin'+'teacher'='linteacher'
'linteacher' anagrammed gives 'IN THE CLEAR'.

'is' is the link.

Can you help me to learn more?

(Other definitions for in the clear that I've seen before include "No longer in danger or suspected of something" , "suspect? Not any more" , "Exonerated" , "out of the wood" , "Free of suspicion, guilt or blame" .)

I've seen this clue in The Independent.

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