Crossword Genius

Keeps loud sort moving (5)

Ross

I believe the answer is:

forts

'keeps' is the definition.

'loud sort moving' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'moving' indicates an anagram (letters are moved around).
'sort' is an anagram of 'orts'.
'f'+'orts'='FORTS'

(Other definitions for forts that I've seen before include "Strongholds" , "Castles" , "Defensive structures where troops are stationed" .)

I've seen this clue in The Mirror.
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