Silence from gym guru? (5)

I believe the answer is:

peace

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'silence' is the definition.
(thesaurus)

'gym guru?' is the wordplay.
'gym' becomes 'pe' (short for Physical Education).
'guru?' becomes 'ace' (I can't explain this - if you can you should believe this answer much more).
'pe'+'ace'='PEACE'

'from' is the link.

Can you help me to learn more?

(Other definitions for peace that I've seen before include "Quiet companion" , "Absence of war" , "Repose, tranquillity" , "See 1" , "[STILLNESS]" .)

I've seen this clue in The Sun.

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